How to Test Firefox Extensions Without Publishing: Local Development Tips Publishing to AMO every time you want to test a change is slow and painful. Here's the full toolkit for local development. Temporary Add-on Loading The fastest way to load your extension: Open Firefox and go to about:debugging Click This Firefox in the left sidebar Click Load Temporary Add-on... Navigate to your extension folder and select manifest.json The extension is loaded immediately. It disappears when Firefox restarts, but stays active during the session. Auto-Reload on File Changes Manually clicking "Reload" in about:debugging is tedious. Use web-ext for auto-reload: npm install --save-dev web-ext # Auto-reload on any file change npx web-ext run --source-dir . --watch # Or add to package.json scripts Enter fullscreen mode Exit fullscreen mode { "scripts" : { "dev" : "web-ext run --source-dir ." , "build" : "web-ext build --source-dir .…