So, clone your repository, install the polyfill, and load your extension into Firefox today. Your future users on the Firefox Add-ons store will thank you.

"browser_specific_settings": "gecko": "id": "my-extension@example.com", "strict_min_version": "57.0"

: 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.