How to Fix \"runtime.lastError\" Errors Caused by Orphaned Content Scripts in Chrome Extensions?

Resolving Orphaned Scripts after Chrome Extension Update

Problem:

After accidentally reloading a Chrome extension, a "runtime.lastError" error occurs due to an "orphaned" content script, resulting in communication failure between the popup and content pages.

Solution:

To address this issue, you can utilize window messages to broadcast a signal from your re-injected content script to the orphaned script. The orphaned script will then deregister its listeners, making it available for garbage collection.

Implementation:

background.js

Implement content script reinjection on extension reload/installation.

content.js

• Generate a unique orphan message ID using chrome.runtime.id.
• Dispatch the orphan message ID event and add an event listener to handle it.
• Register all listeners with named functions to preserve object references.
• Use running = true to indicate an active content script.

unregisterOrphan Function

• Verify if the extension is active.
• Remove the orphan message listener and all other event listeners.

onMessage Function

• Handle incoming messages.

onMouseMove Function

• Execute DOM event handling, checking for orphan status before processing.

popup.js

• Ensure that a content script is injected before sending messages.
• Implement functions to check for active content scripts and inject one if necessary.

By following these steps, you can remove orphaned content scripts and restore communication between your extension's components.

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