diff --git a/src/assets/javascripts/helpers/common.js b/src/assets/javascripts/helpers/common.js
index 82d70e2..74f8edf 100644
--- a/src/assets/javascripts/helpers/common.js
+++ b/src/assets/javascripts/helpers/common.js
@@ -14,6 +14,28 @@ function getRandomInstance(instances) {
   return instances[~~(instances.length * Math.random())];
 }
 
+async function getRandomOnlineInstance(instances) {
+  const shuffledInstances = instances.sort((a, b) => 0.5 - Math.random())
+
+  for (let ins of shuffledInstances) {
+    try {
+      const res = await fetch(ins, { redirect: 'follow' })
+      console.log(res)
+      if (res.status >= 200 && res.status < 300)
+        return ins // instance seems healthy!
+      else
+        console.warn(`Instance ${ins} seems offline (status code: ${res.status}). we try another one`)
+
+    } catch (err) {
+      console.warn(`Instance ${ins} seems offline. we try another one`)
+    }
+  }
+
+  // everything offline? -> unlikely
+  // rather respond with any entry instead of breaking the functionality
+  return shuffledInstances[0]
+}
+
 async function wholeInit() {
   await youtubeHelper.init();
   await twitterHelper.init();
@@ -150,10 +172,11 @@ function processDefaultCustomInstances(
   document.getElementById(`custom-${name}-instance-form`).addEventListener("submit", (event) => {
     event.preventDefault();
     let nameCustomInstanceInput = document.getElementById(`${name}-custom-instance`);
-    let val = nameCustomInstanceInput.value
-    if (nameCustomInstanceInput.validity.valid && !nameHelper.getRedirects()[name].normal.includes(val) && val.trim() != '') {
-      if (!nameCustomInstances.includes(val)) {
-        nameCustomInstances.push(val)
+    let url = new URL(nameCustomInstanceInput.value);
+    let protocolHost = `${url.protocol}//${url.host}`;
+    if (nameCustomInstanceInput.validity.valid && !nameHelper.getRedirects()[name].normal.includes(protocolHost)) {
+      if (!nameCustomInstances.includes(protocolHost)) {
+        nameCustomInstances.push(protocolHost)
         setNameCustomRedirects(nameCustomInstances);
         nameCustomInstanceInput.value = '';
       }
@@ -164,6 +187,7 @@ function processDefaultCustomInstances(
 
 export default {
   getRandomInstance,
+  getRandomOnlineInstance,
   updateInstances,
   isFirefox,
   processDefaultCustomInstances,
diff --git a/src/assets/javascripts/helpers/imgur.js b/src/assets/javascripts/helpers/imgur.js
index 3f5f945..437739d 100644
--- a/src/assets/javascripts/helpers/imgur.js
+++ b/src/assets/javascripts/helpers/imgur.js
@@ -22,6 +22,15 @@ let redirects = {
 }
 
 const getRedirects = () => redirects;
+
+const getCustomRedirects = function () {
+    return {
+        "rimgo": {
+            "normal": [...rimgoRedirectsChecks, ...rimgoCustomRedirects]
+        },
+    };
+};
+
 function setRedirects(val) {
     redirects.rimgo = val;
     browser.storage.sync.set({ imgurRedirects: redirects })
@@ -102,6 +111,7 @@ export default {
     targets,
 
     getRedirects,
+    getCustomRedirects,
     setRedirects,
 
     getDisableImgur,
diff --git a/src/assets/javascripts/helpers/instagram.js b/src/assets/javascripts/helpers/instagram.js
index dc28990..51495dc 100644
--- a/src/assets/javascripts/helpers/instagram.js
+++ b/src/assets/javascripts/helpers/instagram.js
@@ -22,6 +22,13 @@ let redirects = {
   }
 };
 const getRedirects = () => redirects;
+const getCustomRedirects = function () {
+  return {
+    "bibliogram": {
+      "normal": [...bibliogramRedirectsChecks, ...bibliogramCustomRedirects]
+    },
+  };
+};
 function setRedirects(val) {
   redirects.bibliogram = val;
   browser.storage.sync.set({ instagramRedirects: redirects })
@@ -128,6 +135,7 @@ async function init() {
 
 export default {
   getRedirects,
+  getCustomRedirects,
   setRedirects,
 
   getDisableInstagram,
diff --git a/src/assets/javascripts/helpers/medium.js b/src/assets/javascripts/helpers/medium.js
index 348313b..60aa6b6 100644
--- a/src/assets/javascripts/helpers/medium.js
+++ b/src/assets/javascripts/helpers/medium.js
@@ -28,6 +28,13 @@ let redirects = {
   }
 };
 const getRedirects = () => redirects;
+const getCustomRedirects = function () {
+  return {
+    "scribe": {
+      "normal": [...scribeRedirectsChecks, ...scribeCustomRedirects]
+    },
+  };
+};
 function setRedirects(val) {
   redirects.scribe = val;
   browser.storage.sync.set({ mediumRedirects: redirects })
@@ -111,6 +118,7 @@ export default {
   targets,
 
   getRedirects,
+  getCustomRedirects,
   setRedirects,
 
   getDisableMedium,
diff --git a/src/assets/javascripts/helpers/reddit.js b/src/assets/javascripts/helpers/reddit.js
index 0c8d635..740bb99 100644
--- a/src/assets/javascripts/helpers/reddit.js
+++ b/src/assets/javascripts/helpers/reddit.js
@@ -58,6 +58,16 @@ let redirects = {
   "mobile": "https://i.reddit.com", // mobile
 };
 const getRedirects = () => redirects;
+const getCustomRedirects = function () {
+  return {
+    "libreddit": {
+      "normal": [...libredditRedirectsChecks, ...libredditCustomRedirects]
+    },
+    "teddit": {
+      "normal": [...tedditRedirectsChecks, ...tedditCustomRedirects]
+    }
+  };
+};
 
 function setLibredditRedirects(val) {
   redirects.libreddit = val;
@@ -206,6 +216,7 @@ async function init() {
 export default {
   targets,
   getRedirects,
+  getCustomRedirects,
   setTedditRedirects,
   setLibredditRedirects,
 
diff --git a/src/assets/javascripts/helpers/search.js b/src/assets/javascripts/helpers/search.js
index c48a0ed..ed1063c 100644
--- a/src/assets/javascripts/helpers/search.js
+++ b/src/assets/javascripts/helpers/search.js
@@ -134,6 +134,16 @@ let redirects = {
   },
 };
 const getRedirects = () => redirects;
+const getCustomRedirects = function () {
+  return {
+    "searx": {
+      "normal": [...searxRedirectsChecks, ...searxCustomRedirects]
+    },
+    "whoogle": {
+      "normal": [...whoogleRedirectsChecks, ...whoogleCustomRedirects]
+    }
+  };
+};
 
 function setSearxRedirects(val) {
   redirects.searx = val;
@@ -269,6 +279,7 @@ export default {
   isSearch,
 
   getRedirects,
+  getCustomRedirects,
   setSearxRedirects,
   setWhoogleRedirects,
 
diff --git a/src/assets/javascripts/helpers/tiktok.js b/src/assets/javascripts/helpers/tiktok.js
index c2eb2fb..5022db8 100644
--- a/src/assets/javascripts/helpers/tiktok.js
+++ b/src/assets/javascripts/helpers/tiktok.js
@@ -13,6 +13,14 @@ let redirects = {
 }
 
 const getRedirects = () => redirects;
+const getCustomRedirects = function () {
+    return {
+        "proxiTok": {
+            "normal": [...proxiTokRedirectsChecks, ...proxiTokCustomRedirects]
+        },
+    };
+};
+
 function setRedirects(val) {
     redirects.proxiTok = val;
     browser.storage.sync.set({ tiktokRedirects: redirects })
@@ -90,6 +98,7 @@ export default {
     targets,
 
     getRedirects,
+    getCustomRedirects,
     setRedirects,
 
     getDisableTiktok,
diff --git a/src/assets/javascripts/helpers/translate.js b/src/assets/javascripts/helpers/translate.js
index 2f9b61d..074e0a6 100644
--- a/src/assets/javascripts/helpers/translate.js
+++ b/src/assets/javascripts/helpers/translate.js
@@ -37,6 +37,16 @@ let redirects = {
 };
 
 const getRedirects = () => redirects;
+const getCustomRedirects = function () {
+  return {
+    "simplyTranslate": {
+      "normal": [...simplyTranslateRedirectsChecks, ...simplyTranslateCustomRedirects]
+    },
+    "lingva": {
+      "normal": [...lingvaRedirectsChecks, ...lingvaCustomRedirects]
+    }
+  };
+};
 
 function setSimplyTranslateRedirects(val) {
   redirects.simplyTranslate = val;
@@ -174,6 +184,7 @@ async function init() {
 
 export default {
   getRedirects,
+  getCustomRedirects,
   setSimplyTranslateRedirects,
   setLingvaRedirects,
 
diff --git a/src/assets/javascripts/helpers/twitter.js b/src/assets/javascripts/helpers/twitter.js
index a56ceeb..782c41a 100644
--- a/src/assets/javascripts/helpers/twitter.js
+++ b/src/assets/javascripts/helpers/twitter.js
@@ -78,6 +78,13 @@ let redirects = {
   }
 };
 const getRedirects = () => redirects;
+const getCustomRedirects = function () {
+  return {
+    "nitter": {
+      "normal": [...nitterRedirectsChecks, ...nitterCustomRedirects]
+    },
+  };
+};
 function setRedirects(val) {
   redirects.nitter = val;
   browser.storage.sync.set({ twitterRedirects: redirects })
@@ -90,11 +97,11 @@ function setNitterRedirectsChecks(val) {
   nitterRedirectsChecks = val;
   browser.storage.sync.set({ nitterRedirectsChecks })
   for (const item of nitterRedirectsChecks)
-  if (!redirects.nitter.normal.includes(item)) {
-    var index = nitterRedirectsChecks.indexOf(item);
-    if (index !== -1) nitterRedirectsChecks.splice(index, 1);
-  }
-setNitterRedirectsChecks(nitterRedirectsChecks);
+    if (!redirects.nitter.normal.includes(item)) {
+      var index = nitterRedirectsChecks.indexOf(item);
+      if (index !== -1) nitterRedirectsChecks.splice(index, 1);
+    }
+  setNitterRedirectsChecks(nitterRedirectsChecks);
   console.log("nitterRedirectsChecks: ", val)
 }
 
@@ -166,6 +173,7 @@ async function init() {
 
 export default {
   getRedirects,
+  getCustomRedirects,
   setRedirects,
 
   getDisableTwitter,
diff --git a/src/assets/javascripts/helpers/wikipedia.js b/src/assets/javascripts/helpers/wikipedia.js
index a2d84d0..62a09e1 100644
--- a/src/assets/javascripts/helpers/wikipedia.js
+++ b/src/assets/javascripts/helpers/wikipedia.js
@@ -16,16 +16,23 @@ let redirects = {
   }
 };
 const getRedirects = () => redirects;
+const getCustomRedirects = function () {
+  return {
+    "wikiless": {
+      "normal": [...wikilessRedirectsChecks, ...wikilessCustomRedirects]
+    },
+  };
+};
 function setRedirects(val) {
   redirects.wikiless = val;
   browser.storage.sync.set({ wikipediaRedirects: redirects })
   console.log("wikipediaRedirects: ", val)
   for (const item of wikilessRedirectsChecks)
-  if (!redirects.wikiless.normal.includes(item)) {
-    var index = wikilessRedirectsChecks.indexOf(item);
-    if (index !== -1) wikilessRedirectsChecks.splice(index, 1);
-  }
-setWikilessRedirectsChecks(wikilessRedirectsChecks);
+    if (!redirects.wikiless.normal.includes(item)) {
+      var index = wikilessRedirectsChecks.indexOf(item);
+      if (index !== -1) wikilessRedirectsChecks.splice(index, 1);
+    }
+  setWikilessRedirectsChecks(wikilessRedirectsChecks);
 }
 
 let disableWikipedia;
@@ -115,6 +122,7 @@ async function init() {
 
 export default {
   getRedirects,
+  getCustomRedirects,
   setRedirects,
 
   setDisableWikipedia,
diff --git a/src/assets/javascripts/helpers/youtube/youtube.js b/src/assets/javascripts/helpers/youtube/youtube.js
index 8e5f2ea..be20b72 100644
--- a/src/assets/javascripts/helpers/youtube/youtube.js
+++ b/src/assets/javascripts/helpers/youtube/youtube.js
@@ -54,6 +54,17 @@ let redirects = {
 
 const getRedirects = () => redirects;
 
+const getCustomRedirects = function () {
+  return {
+    "invidious": {
+      "normal": [...invidiousRedirectsChecks, ...invidiousCustomRedirects]
+    },
+    "piped": {
+      "normal": [...pipedRedirectsChecks, ...pipedCustomRedirects]
+    }
+  };
+};
+
 function setInvidiousRedirects(val) {
   redirects.invidious = val;
   browser.storage.sync.set({ youtubeRedirects: redirects })
@@ -320,6 +331,7 @@ export default {
   setFrontend,
 
   getRedirects,
+  getCustomRedirects,
   setInvidiousRedirects,
   setPipedRedirects,
 
diff --git a/src/pages/background/background.js b/src/pages/background/background.js
index 140f171..aa97e2f 100644
--- a/src/pages/background/background.js
+++ b/src/pages/background/background.js
@@ -81,6 +81,22 @@ browser.webRequest.onBeforeRequest.addListener(
   ["blocking"]
 );
 
+browser.webRequest.onResponseStarted.addListener(
+  (responseDetails) => {
+    let url = new URL(responseDetails.url);
+    let protocolHost = `${url.protocol}//${url.host}`;
+    var mightyList = getMightyList();
+
+    if (mightyList.includes(protocolHost)); {
+      if (responseDetails.statusCode < 200 || responseDetails.statusCode >= 300) {
+        console.log("Instance is corrupted, redirecting", responseDetails.url);
+        changeInstance(responseDetails.url);
+      }
+    }
+  },
+  { urls: ["<all_urls>"] }
+);
+
 browser.tabs.onUpdated.addListener((tabId, changeInfo, _) => {
   let url;
   try {
@@ -90,50 +106,25 @@ browser.tabs.onUpdated.addListener((tabId, changeInfo, _) => {
   }
   var protocolHost = `${url.protocol}//${url.host}`;
 
-
   if (youtubeHelper.getRedirects().invidious.normal.includes(protocolHost)) {
     if (youtubeHelper.getPersistInvidiousPrefs())
       youtubeHelper.invidiousInitCookies(tabId);
   }
 
-  var mightyList = [];
-  mightyList.push(
-    ...youtubeHelper.getRedirects().invidious.normal,
-    ...youtubeHelper.getRedirects().piped.normal,
-
-    ...twitterHelper.getRedirects().nitter.normal,
-
-    ...instagramHelper.getRedirects().bibliogram.normal,
-
-    ...redditHelper.getRedirects().libreddit.normal,
-    ...redditHelper.getRedirects().teddit.normal,
-    redditHelper.getRedirects().desktop,
-    redditHelper.getRedirects().mobile,
-
-    ...searchHelper.getRedirects().searx.normal,
-    ...searchHelper.getRedirects().whoogle.normal,
-
-    ...translateHelper.getRedirects().simplyTranslate.normal,
-    ...translateHelper.getRedirects().lingva.normal,
-
-    ...mediumHelper.getRedirects().scribe.normal,
-    ...imgurHelper.getRedirects().rimgo.normal,
-
-    ...wikipediaHelper.getRedirects().wikiless.normal
-  );
+  var mightyList = getMightyList();
 
   if (mightyList.includes(protocolHost)) browser.pageAction.show(tabId);
 });
 
 
-browser.pageAction.onClicked.addListener((tab) => {
-  var tabUrl = new URL(tab.url);
+function changeInstance(url) {
+  var tabUrl = new URL(url);
   var protocolHost = `${tabUrl.protocol}//${tabUrl.host}`;
   var newUrl;
 
   if (
-    youtubeHelper.getRedirects().invidious.normal.includes(protocolHost) ||
-    youtubeHelper.getRedirects().piped.normal.includes(protocolHost)
+    youtubeHelper.getCustomRedirects().invidious.normal.includes(protocolHost) ||
+    youtubeHelper.getCustomRedirects().piped.normal.includes(protocolHost)
   )
     newUrl = 'https://youtube.com';
 
@@ -167,5 +158,27 @@ browser.pageAction.onClicked.addListener((tab) => {
   if (wikipediaHelper.getRedirects().wikiless.normal.includes(protocolHost)) newUrl = 'https://wikipedia.com';
 
   if (newUrl) browser.tabs.update({ url: tabUrl.href.replace(protocolHost, newUrl) });
-});
+}
 
+
+browser.pageAction.onClicked.addListener((tab) => changeInstance(tab.url));
+
+function getMightyList() {
+  return [
+    ...youtubeHelper.getCustomRedirects().invidious.normal,
+    ...youtubeHelper.getCustomRedirects().piped.normal,
+    ...twitterHelper.getCustomRedirects().nitter.normal,
+    ...instagramHelper.getCustomRedirects().bibliogram.normal,
+    ...redditHelper.getCustomRedirects().libreddit.normal,
+    ...redditHelper.getCustomRedirects().teddit.normal,
+    redditHelper.getCustomRedirects().desktop,
+    redditHelper.getCustomRedirects().mobile,
+    ...searchHelper.getCustomRedirects().searx.normal,
+    ...searchHelper.getCustomRedirects().whoogle.normal,
+    ...translateHelper.getCustomRedirects().simplyTranslate.normal,
+    ...translateHelper.getCustomRedirects().lingva.normal,
+    ...mediumHelper.getCustomRedirects().scribe.normal,
+    ...imgurHelper.getCustomRedirects().rimgo.normal,
+    ...wikipediaHelper.getCustomRedirects().wikiless.normal
+  ];
+}