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background.js

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+// Extension initialization
+chrome.runtime.onInstalled.addListener(() => {
+    console.log("Word Replacer Addon installed.");
+    
+    // Set default replacements if they don't already exist
+    chrome.storage.local.get('wordReplacements', (data) => {
+        if (!data.wordReplacements) {
+            chrome.storage.local.set({
+                wordReplacements: {
+                    "oldWord1": "newWord1",
+                    "oldWord2": "newWord2",
+                    "oldWord3": "newWord3"
+                }
+            });
+        }
+    });
+});
+
+// Data cleanup when possible
+function cleanupStorageData() {
+    chrome.storage.local.clear(() => {
+        console.log("Extension storage cleared.");
+    });
+}
+
+// For Firefox we can use onSuspend which is called when the extension process
+// is terminated (can happen on deactivation or uninstallation)
+chrome.runtime.onSuspend.addListener(() => {
+    console.log("Word Replacer Addon terminated.");
+    // Uncomment the following line if you want to remove all data on suspension
+    // cleanupStorageData();
+});
+
+// Add a command to manually clean the data
+chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
+    if (message.action === 'getReplacements') {
+        chrome.storage.local.get('wordReplacements', (data) => {
+            sendResponse(data.wordReplacements || {});
+        });
+        return true; // Required for asynchronous sendResponse
+    }
+    
+    // New command to clean the data
+    if (message.action === 'clearStorageData') {
+        cleanupStorageData();
+        sendResponse({success: true});
+        return true;
+    }
+});