: While Chrome has phased out Manifest V2 in favor of Manifest V3 , Firefox continues to support both. If your Chrome extension uses V3 service workers, note that Firefox's V3 implementation may require slight adjustments for background script persistence.
Before diving into the code, let’s address the "why." Many developers assume the effort isn't worth the return. That is a misconception. convert chrome extension to firefox
When the extension runs on Chrome, this key is simply ignored. When on Firefox, users get a toggleable sidebar. : While Chrome has phased out Manifest V2
Firefox and Chrome share a common foundation, but their JavaScript execution environments have two primary differences: Porting A Chrome Extension to Firefox - Darren Lester convert chrome extension to firefox