"background": "scripts": ["background.js"], "persistent": true
If your Chrome extension uses a (MV3 default): convert chrome extension to firefox
This guide will walk you through the entire process: from analyzing compatibility, modifying the manifest, adjusting API calls, using polyfills, debugging, and finally publishing to the Firefox Browser Add-ons store. "background": "scripts": ["background
For most extensions, conversion takes 1–8 hours of developer work, primarily involving namespace changes and adjusting background scripts. "background": "scripts": ["background.js"]
When the extension runs on Chrome, this key is simply ignored. When on Firefox, users get a toggleable sidebar.