How Do I Fix Communication Issues Caused by Orphaned Scripts in Chrome Extensions?

Troubleshooting Orphaned Scripts in Chrome Extensions

Recovering after accidentally reloading a Chrome extension can result in orphaned scripts, leading to communication issues between the content script and other parts of the extension. Here's a solution to remove the orphaned script and restore proper functioning:

Killing the Orphan Script

The orphaned content script can still receive DOM messages. Send a message from your new working content script to the ghosted content script via the window object. Upon receiving the message, the orphaned script should:

• Unregister all event listeners (and nullify any global variables) to make itself eligible for garbage collection.

• In content.js:

  <code class="javascript">var orphanMessageId = chrome.runtime.id + 'orphanCheck';
  window.dispatchEvent(new Event(orphanMessageId));
  window.addEventListener(orphanMessageId, unregisterOrphan);
  
  // ... Register event listeners with named functions to preserve their references
  
  function unregisterOrphan() {
  // ... Unregister listeners and remove global variables
  }</code>

Ensuring Content Script Injection

To prevent sending messages to an orphaned script, your popup.js should check if a live content script is running before sending messages:

<code class="javascript">async function sendMessage(data) {
  const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
  if (await ensureContentScript(tab.id)) {
    return await chrome.tabs.sendMessage(tab.id, data);
  }
}

async function ensureContentScript(tabId) {
  // ... Check if content script is running and inject it if not
}</code>

By implementing these measures, you can effectively remove orphaned scripts, prevent communication issues, and restore the functionality of your Chrome extension.

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