diff --git a/public/scripts/RossAscends-mods.js b/public/scripts/RossAscends-mods.js
index 5179cad62..d7f4025e0 100644
--- a/public/scripts/RossAscends-mods.js
+++ b/public/scripts/RossAscends-mods.js
@@ -1120,7 +1120,7 @@ export function initRossMods() {
                     const result = await Popup.show.confirm('Regenerate Message', 'Are you sure you want to regenerate the latest message?', {
                         customInputs: [{ id: 'regenerateWithCtrlEnter', label: 'Don\'t ask again' }],
                         onClose: (popup) => {
-                            regenerateWithCtrlEnter = popup.inputResults.get('regenerateWithCtrlEnter') ?? false;
+                            regenerateWithCtrlEnter = Boolean(popup.inputResults.get('regenerateWithCtrlEnter') ?? false);
                         },
                     });
                     if (!result) {
diff --git a/public/scripts/extensions.js b/public/scripts/extensions.js
index 5c22da7a0..df6e8b898 100644
--- a/public/scripts/extensions.js
+++ b/public/scripts/extensions.js
@@ -661,6 +661,7 @@ function generateExtensionHtml(name, manifest, isActive, isDisabled, isExternal,
     let deleteButton = isExternal ? `<button class="btn_delete menu_button" data-name="${externalId}" data-i18n="[title]Delete" title="Delete"><i class="fa-fw fa-solid fa-trash-can"></i></button>` : '';
     let updateButton = isExternal ? `<button class="btn_update menu_button displayNone" data-name="${externalId}" title="Update available"><i class="fa-solid fa-download fa-fw"></i></button>` : '';
     let moveButton = isExternal && isUserAdmin ? `<button class="btn_move menu_button" data-name="${externalId}" data-i18n="[title]Move" title="Move"><i class="fa-solid fa-folder-tree fa-fw"></i></button>` : '';
+    let branchButton = isExternal && isUserAdmin ? `<button class="btn_branch menu_button" data-name="${externalId}" data-i18n="[title]Switch branch" title="Switch branch"><i class="fa-solid fa-code-branch fa-fw"></i></button>` : '';
     let modulesInfo = '';
 
     if (isActive && Array.isArray(manifest.optional)) {
@@ -701,6 +702,7 @@ function generateExtensionHtml(name, manifest, isActive, isDisabled, isExternal,
 
             <div class="extension_actions flex-container alignItemsCenter">
                 ${updateButton}
+                ${branchButton}
                 ${moveButton}
                 ${deleteButton}
             </div>
@@ -944,6 +946,44 @@ async function onDeleteClick() {
     }
 }
 
+async function onBranchClick() {
+    const extensionName = $(this).data('name');
+    const isCurrentUserAdmin = isAdmin();
+    const isGlobal = getExtensionType(extensionName) === 'global';
+    if (isGlobal && !isCurrentUserAdmin) {
+        toastr.error(t`You don't have permission to switch branch.`);
+        return;
+    }
+
+    let newBranch = '';
+
+    const branches = await getExtensionBranches(extensionName, isGlobal);
+    const selectElement = document.createElement('select');
+    selectElement.classList.add('text_pole', 'wide100p');
+    selectElement.addEventListener('change', function () {
+        newBranch = this.value;
+    });
+    for (const branch of branches) {
+        const option = document.createElement('option');
+        option.value = branch.name;
+        option.textContent = `${branch.name} (${branch.commit}) [${branch.label}]`;
+        option.selected = branch.current;
+        selectElement.appendChild(option);
+    }
+
+    const popup = new Popup(selectElement, POPUP_TYPE.CONFIRM, '', {
+        okButton: t`Switch`,
+        cancelButton: t`Cancel`,
+    });
+    const popupResult = await popup.show();
+
+    if (!popupResult || !newBranch) {
+        return;
+    }
+
+    await switchExtensionBranch(extensionName, isGlobal, newBranch);
+}
+
 async function onMoveClick() {
     const extensionName = $(this).data('name');
     const isCurrentUserAdmin = isAdmin();
@@ -1055,13 +1095,83 @@ async function getExtensionVersion(extensionName, abortSignal) {
     }
 }
 
+/**
+ * Gets the list of branches for a specific extension.
+ * @param {string} extensionName The name of the extension
+ * @param {boolean} isGlobal Whether the extension is global or not
+ * @returns {Promise<ExtensionBranch[]>} List of branches for the extension
+ * @typedef {object} ExtensionBranch
+ * @property {string} name The name of the branch
+ * @property {string} commit The commit hash of the branch
+ * @property {boolean} current Whether this branch is the current one
+ * @property {string} label The commit label of the branch
+ */
+async function getExtensionBranches(extensionName, isGlobal) {
+    try {
+        const response = await fetch('/api/extensions/branches', {
+            method: 'POST',
+            headers: getRequestHeaders(),
+            body: JSON.stringify({
+                extensionName,
+                global: isGlobal,
+            }),
+        });
+
+        if (!response.ok) {
+            const text = await response.text();
+            toastr.error(text || response.statusText, t`Extension branches fetch failed`);
+            console.error('Extension branches fetch failed', response.status, response.statusText, text);
+            return [];
+        }
+
+        return await response.json();
+    } catch (error) {
+        console.error('Error:', error);
+        return [];
+    }
+}
+
+/**
+ * Switches the branch of an extension.
+ * @param {string} extensionName The name of the extension
+ * @param {boolean} isGlobal If the extension is global
+ * @param {string} branch Branch name to switch to
+ * @returns {Promise<void>}
+ */
+async function switchExtensionBranch(extensionName, isGlobal, branch) {
+    try {
+        const response = await fetch('/api/extensions/switch', {
+            method: 'POST',
+            headers: getRequestHeaders(),
+            body: JSON.stringify({
+                extensionName,
+                branch,
+                global: isGlobal,
+            }),
+        });
+
+        if (!response.ok) {
+            const text = await response.text();
+            toastr.error(text || response.statusText, t`Extension branch switch failed`);
+            console.error('Extension branch switch failed', response.status, response.statusText, text);
+            return;
+        }
+
+        toastr.success(t`Extension ${extensionName} switched to ${branch}`);
+        await loadExtensionSettings({}, false, false);
+        void showExtensionsDetails();
+    } catch (error) {
+        console.error('Error:', error);
+    }
+}
+
 /**
  * Installs a third-party extension via the API.
  * @param {string} url Extension repository URL
  * @param {boolean} global Is the extension global?
  * @returns {Promise<void>}
  */
-export async function installExtension(url, global) {
+export async function installExtension(url, global, branch = '') {
     console.debug('Extension installation started', url);
 
     toastr.info(t`Please wait...`, t`Installing extension`);
@@ -1072,6 +1182,7 @@ export async function installExtension(url, global) {
         body: JSON.stringify({
             url,
             global,
+            branch,
         }),
     });
 
@@ -1406,9 +1517,17 @@ export async function openThirdPartyExtensionMenu(suggestUrl = '') {
             await popup.complete(POPUP_RESULT.AFFIRMATIVE);
         },
     };
+    /** @type {import('./popup.js').CustomPopupInput} */
+    const branchNameInput = {
+        id: 'extension_branch_name',
+        label: t`Branch or tag name (optional)`,
+        type: 'text',
+        tooltip: 'e.g. main, dev, v1.0.0',
+    };
 
     const customButtons = isCurrentUserAdmin ? [installForAllButton] : [];
-    const popup = new Popup(html, POPUP_TYPE.INPUT, suggestUrl ?? '', { okButton, customButtons });
+    const customInputs = [branchNameInput];
+    const popup = new Popup(html, POPUP_TYPE.INPUT, suggestUrl ?? '', { okButton, customButtons, customInputs });
     const input = await popup.show();
 
     if (!input) {
@@ -1417,7 +1536,8 @@ export async function openThirdPartyExtensionMenu(suggestUrl = '') {
     }
 
     const url = String(input).trim();
-    await installExtension(url, global);
+    const branchName = String(popup.inputResults.get('extension_branch_name') ?? '').trim();
+    await installExtension(url, global, branchName);
 }
 
 export async function initExtensions() {
@@ -1433,6 +1553,7 @@ export async function initExtensions() {
     $(document).on('click', '.extensions_info .extension_block .btn_update', onUpdateClick);
     $(document).on('click', '.extensions_info .extension_block .btn_delete', onDeleteClick);
     $(document).on('click', '.extensions_info .extension_block .btn_move', onMoveClick);
+    $(document).on('click', '.extensions_info .extension_block .btn_branch', onBranchClick);
 
     /**
      * Handles the click event for the third-party extension import button.
diff --git a/public/scripts/extensions/assets/index.js b/public/scripts/extensions/assets/index.js
index 014db82cd..c3e14fda4 100644
--- a/public/scripts/extensions/assets/index.js
+++ b/public/scripts/extensions/assets/index.js
@@ -291,7 +291,7 @@ async function installAsset(url, assetType, filename) {
     try {
         if (category === 'extension') {
             console.debug(DEBUG_PREFIX, 'Installing extension ', url);
-            await installExtension(url);
+            await installExtension(url, false);
             console.debug(DEBUG_PREFIX, 'Extension installed.');
             return;
         }
@@ -309,7 +309,7 @@ async function installAsset(url, assetType, filename) {
                 console.debug(DEBUG_PREFIX, 'Importing character ', filename);
                 const blob = await result.blob();
                 const file = new File([blob], filename, { type: blob.type });
-                await processDroppedFiles([file], true);
+                await processDroppedFiles([file]);
                 console.debug(DEBUG_PREFIX, 'Character downloaded.');
             }
         }
diff --git a/public/scripts/popup.js b/public/scripts/popup.js
index aaadce1b1..3a1b03877 100644
--- a/public/scripts/popup.js
+++ b/public/scripts/popup.js
@@ -71,7 +71,8 @@ export const POPUP_RESULT = {
  * @property {string} id - The id for the html element
  * @property {string} label - The label text for the input
  * @property {string?} [tooltip=null] - Optional tooltip icon displayed behind the label
- * @property {boolean?} [defaultState=false] - The default state when opening the popup (false if not set)
+ * @property {boolean|string|undefined} [defaultState=false] - The default state when opening the popup (false if not set)
+ * @property {string?} [type='checkbox'] - The type of the input (default is checkbox)
  */
 
 /**
@@ -157,7 +158,7 @@ export class Popup {
 
     /** @type {POPUP_RESULT|number} */ result;
     /** @type {any} */ value;
-    /** @type {Map<string,boolean>?} */ inputResults;
+    /** @type {Map<string,string|boolean>?} */ inputResults;
     /** @type {any} */ cropData;
 
     /** @type {HTMLElement} */ lastFocus;
@@ -260,28 +261,53 @@ export class Popup {
                 return;
             }
 
-            const label = document.createElement('label');
-            label.classList.add('checkbox_label', 'justifyCenter');
-            label.setAttribute('for', input.id);
-            const inputElement = document.createElement('input');
-            inputElement.type = 'checkbox';
-            inputElement.id = input.id;
-            inputElement.checked = input.defaultState ?? false;
-            label.appendChild(inputElement);
-            const labelText = document.createElement('span');
-            labelText.innerText = input.label;
-            labelText.dataset.i18n = input.label;
-            label.appendChild(labelText);
+            if (!input.type || input.type === 'checkbox') {
+                const label = document.createElement('label');
+                label.classList.add('checkbox_label', 'justifyCenter');
+                label.setAttribute('for', input.id);
+                const inputElement = document.createElement('input');
+                inputElement.type = 'checkbox';
+                inputElement.id = input.id;
+                inputElement.checked = Boolean(input.defaultState ?? false);
+                label.appendChild(inputElement);
+                const labelText = document.createElement('span');
+                labelText.innerText = input.label;
+                labelText.dataset.i18n = input.label;
+                label.appendChild(labelText);
 
-            if (input.tooltip) {
-                const tooltip = document.createElement('div');
-                tooltip.classList.add('fa-solid', 'fa-circle-info', 'opacity50p');
-                tooltip.title = input.tooltip;
-                tooltip.dataset.i18n = '[title]' + input.tooltip;
-                label.appendChild(tooltip);
+                if (input.tooltip) {
+                    const tooltip = document.createElement('div');
+                    tooltip.classList.add('fa-solid', 'fa-circle-info', 'opacity50p');
+                    tooltip.title = input.tooltip;
+                    tooltip.dataset.i18n = '[title]' + input.tooltip;
+                    label.appendChild(tooltip);
+                }
+
+                this.inputControls.appendChild(label);
+            } else if (input.type === 'text') {
+                const label = document.createElement('label');
+                label.classList.add('text_label', 'justifyCenter');
+                label.setAttribute('for', input.id);
+
+                const inputElement = document.createElement('input');
+                inputElement.classList.add('text_pole');
+                inputElement.type = 'text';
+                inputElement.id = input.id;
+                inputElement.value = String(input.defaultState ?? '');
+                inputElement.placeholder = input.tooltip ?? '';
+
+                const labelText = document.createElement('span');
+                labelText.innerText = input.label;
+                labelText.dataset.i18n = input.label;
+
+                label.appendChild(labelText);
+                label.appendChild(inputElement);
+
+                this.inputControls.appendChild(label);
+            } else {
+                console.warn('Unknown custom input type. Only checkbox and text are supported.', input);
+                return;
             }
-
-            this.inputControls.appendChild(label);
         });
 
         // Set the default button class
@@ -529,7 +555,8 @@ export class Popup {
             this.inputResults = new Map(this.customInputs.map(input => {
                 /** @type {HTMLInputElement} */
                 const inputControl = this.dlg.querySelector(`#${input.id}`);
-                return [inputControl.id, inputControl.checked];
+                const value = input.type === 'text' ? inputControl.value : inputControl.checked;
+                return [inputControl.id, value];
             }));
         }
 
@@ -619,7 +646,7 @@ export class Popup {
         /** @readonly @type {Popup[]} Remember all popups */
         popups: [],
 
-        /** @type {{value: any, result: POPUP_RESULT|number?, inputResults: Map<string, boolean>?}?} Last popup result */
+        /** @type {{value: any, result: POPUP_RESULT|number?, inputResults: Map<string, string|boolean>?}?} Last popup result */
         lastResult: null,
 
         /** @returns {boolean} Checks if any modal popup dialog is open */
diff --git a/src/endpoints/extensions.js b/src/endpoints/extensions.js
index 2827d8058..6ac291b8e 100644
--- a/src/endpoints/extensions.js
+++ b/src/endpoints/extensions.js
@@ -30,17 +30,23 @@ async function getManifest(extensionPath) {
  * @returns {Promise<Object>} - Returns the extension information as an object
  */
 async function checkIfRepoIsUpToDate(extensionPath) {
-    const git = simpleGit();
-    await git.cwd(extensionPath).fetch('origin');
-    const currentBranch = await git.cwd(extensionPath).branch();
-    const currentCommitHash = await git.cwd(extensionPath).revparse(['HEAD']);
-    const log = await git.cwd(extensionPath).log({
+    const git = simpleGit({ baseDir: extensionPath });
+    await git.fetch('origin');
+    const currentBranch = await git.branch();
+    const currentCommitHash = await git.revparse(['HEAD']);
+    const log = await git.log({
         from: currentCommitHash,
         to: `origin/${currentBranch.current}`,
     });
 
     // Fetch remote repository information
-    const remotes = await git.cwd(extensionPath).getRemotes(true);
+    const remotes = await git.getRemotes(true);
+    if (remotes.length === 0) {
+        return {
+            isUpToDate: true,
+            remoteUrl: '',
+        };
+    }
 
     return {
         isUpToDate: log.total === 0,
@@ -76,7 +82,7 @@ router.post('/install', async (request, response) => {
             fs.mkdirSync(PUBLIC_DIRECTORIES.globalExtensions);
         }
 
-        const { url, global } = request.body;
+        const { url, global, branch } = request.body;
 
         if (global && !request.user.profile.admin) {
             console.error(`User ${request.user.profile.handle} does not have permission to install global extensions.`);
@@ -90,8 +96,12 @@ router.post('/install', async (request, response) => {
             return response.status(409).send(`Directory already exists at ${extensionPath}`);
         }
 
-        await git.clone(url, extensionPath, { '--depth': 1 });
-        console.info(`Extension has been cloned at ${extensionPath}`);
+        const cloneOptions = { '--depth': 1 };
+        if (branch) {
+            cloneOptions['--branch'] = branch;
+        }
+        await git.clone(url, extensionPath, cloneOptions);
+        console.info(`Extension has been cloned to ${extensionPath} from ${url} at ${branch || '(default)'} branch`);
 
         const { version, author, display_name } = await getManifest(extensionPath);
 
@@ -114,7 +124,6 @@ router.post('/install', async (request, response) => {
  * @returns {void}
  */
 router.post('/update', async (request, response) => {
-    const git = simpleGit();
     if (!request.body.extensionName) {
         return response.status(400).send('Bad Request: extensionName is required in the request body.');
     }
@@ -128,22 +137,23 @@ router.post('/update', async (request, response) => {
         }
 
         const basePath = global ? PUBLIC_DIRECTORIES.globalExtensions : request.user.directories.extensions;
-        const extensionPath = path.join(basePath, extensionName);
+        const extensionPath = path.join(basePath, sanitize(extensionName));
 
         if (!fs.existsSync(extensionPath)) {
             return response.status(404).send(`Directory does not exist at ${extensionPath}`);
         }
 
         const { isUpToDate, remoteUrl } = await checkIfRepoIsUpToDate(extensionPath);
-        const currentBranch = await git.cwd(extensionPath).branch();
+        const git = simpleGit({ baseDir: extensionPath });
+        const currentBranch = await git.branch();
         if (!isUpToDate) {
-            await git.cwd(extensionPath).pull('origin', currentBranch.current);
+            await git.pull('origin', currentBranch.current);
             console.info(`Extension has been updated at ${extensionPath}`);
         } else {
             console.info(`Extension is up to date at ${extensionPath}`);
         }
-        await git.cwd(extensionPath).fetch('origin');
-        const fullCommitHash = await git.cwd(extensionPath).revparse(['HEAD']);
+        await git.fetch('origin');
+        const fullCommitHash = await git.revparse(['HEAD']);
         const shortCommitHash = fullCommitHash.slice(0, 7);
 
         return response.send({ shortCommitHash, extensionPath, isUpToDate, remoteUrl });
@@ -154,6 +164,110 @@ router.post('/update', async (request, response) => {
     }
 });
 
+router.post('/branches', async (request, response) => {
+    try {
+        const { extensionName, global } = request.body;
+
+        if (!extensionName) {
+            return response.status(400).send('Bad Request: extensionName is required in the request body.');
+        }
+
+        if (global && !request.user.profile.admin) {
+            console.error(`User ${request.user.profile.handle} does not have permission to list branches of global extensions.`);
+            return response.status(403).send('Forbidden: No permission to list branches of global extensions.');
+        }
+
+        const basePath = global ? PUBLIC_DIRECTORIES.globalExtensions : request.user.directories.extensions;
+        const extensionPath = path.join(basePath, sanitize(extensionName));
+
+        if (!fs.existsSync(extensionPath)) {
+            return response.status(404).send(`Directory does not exist at ${extensionPath}`);
+        }
+
+        const git = simpleGit({ baseDir: extensionPath });
+        // Unshallow the repository if it is shallow
+        const isShallow = await git.revparse(['--is-shallow-repository']) === 'true';
+        if (isShallow) {
+            console.info(`Unshallowing the repository at ${extensionPath}`);
+            await git.fetch('origin', ['--unshallow']);
+        }
+
+        // Fetch all branches
+        await git.remote(['set-branches', 'origin', '*']);
+        await git.fetch('origin');
+        const localBranches = await git.branchLocal();
+        const remoteBranches = await git.branch(['-r', '--list', 'origin/*']);
+        const result = [
+            ...Object.values(localBranches.branches),
+            ...Object.values(remoteBranches.branches),
+        ].map(b => ({ current: b.current, commit: b.commit, name: b.name, label: b.label }));
+
+        return response.send(result);
+    } catch (error) {
+        console.error('Getting branches failed', error);
+        return response.status(500).send('Internal Server Error. Check the server logs for more details.');
+    }
+});
+
+router.post('/switch', async (request, response) => {
+    try {
+        const { extensionName, branch, global } = request.body;
+
+        if (!extensionName || !branch) {
+            return response.status(400).send('Bad Request: extensionName and branch are required in the request body.');
+        }
+
+        if (global && !request.user.profile.admin) {
+            console.error(`User ${request.user.profile.handle} does not have permission to switch branches of global extensions.`);
+            return response.status(403).send('Forbidden: No permission to switch branches of global extensions.');
+        }
+
+        const basePath = global ? PUBLIC_DIRECTORIES.globalExtensions : request.user.directories.extensions;
+        const extensionPath = path.join(basePath, sanitize(extensionName));
+
+        if (!fs.existsSync(extensionPath)) {
+            return response.status(404).send(`Directory does not exist at ${extensionPath}`);
+        }
+
+        const git = simpleGit({ baseDir: extensionPath });
+        const branches = await git.branchLocal();
+
+        if (String(branch).startsWith('origin/')) {
+            const localBranch = branch.replace('origin/', '');
+            if (branches.all.includes(localBranch)) {
+                console.info(`Branch ${localBranch} already exists locally, checking it out`);
+                await git.checkout(localBranch);
+                return response.sendStatus(204);
+            }
+
+            console.info(`Branch ${localBranch} does not exist locally, creating it from ${branch}`);
+            await git.checkoutBranch(localBranch, branch);
+            return response.sendStatus(204);
+        }
+
+        if (!branches.all.includes(branch)) {
+            console.error(`Branch ${branch} does not exist locally`);
+            return response.status(404).send(`Branch ${branch} does not exist locally`);
+        }
+
+        // Check if the branch is already checked out
+        const currentBranch = await git.branch();
+        if (currentBranch.current === branch) {
+            console.info(`Branch ${branch} is already checked out`);
+            return response.sendStatus(204);
+        }
+
+        // Checkout the branch
+        await git.checkout(branch);
+        console.info(`Checked out branch ${branch} at ${extensionPath}`);
+
+        return response.sendStatus(204);
+    } catch (error) {
+        console.error('Switching branches failed', error);
+        return response.status(500).send('Internal Server Error. Check the server logs for more details.');
+    }
+});
+
 router.post('/move', async (request, response) => {
     try {
         const { extensionName, source, destination } = request.body;
@@ -194,7 +308,7 @@ router.post('/move', async (request, response) => {
         return response.sendStatus(204);
     } catch (error) {
         console.error('Moving extension failed', error);
-        return response.status(500).send('Internal Server Error. Try again later.');
+        return response.status(500).send('Internal Server Error. Check the server logs for more details.');
     }
 });
 
@@ -209,7 +323,6 @@ router.post('/move', async (request, response) => {
  * @returns {void}
  */
 router.post('/version', async (request, response) => {
-    const git = simpleGit();
     if (!request.body.extensionName) {
         return response.status(400).send('Bad Request: extensionName is required in the request body.');
     }
@@ -223,19 +336,20 @@ router.post('/version', async (request, response) => {
             return response.status(404).send(`Directory does not exist at ${extensionPath}`);
         }
 
+        const git = simpleGit({ baseDir: extensionPath });
         let currentCommitHash;
         try {
-            currentCommitHash = await git.cwd(extensionPath).revparse(['HEAD']);
+            currentCommitHash = await git.revparse(['HEAD']);
         } catch (error) {
             // it is not a git repo, or has no commits yet, or is a bare repo
             // not possible to update it, most likely can't get the branch name either
             return response.send({ currentBranchName: '', currentCommitHash: '', isUpToDate: true, remoteUrl: '' });
         }
 
-        const currentBranch = await git.cwd(extensionPath).branch();
+        const currentBranch = await git.branch();
         // get only the working branch
         const currentBranchName = currentBranch.current;
-        await git.cwd(extensionPath).fetch('origin');
+        await git.fetch('origin');
         console.debug(extensionName, currentBranchName, currentCommitHash);
         const { isUpToDate, remoteUrl } = await checkIfRepoIsUpToDate(extensionPath);