Firefox add-ons and browser extensions
Extensions – also known as Firefox Add-ons – are extra features you can download and install to add more functionality and tools to your browser. Add-ons allow you to customize your Firefox browser and enhance the way you use the web.
There are Firefox add-ons that stop Facebook from tracking you around the web, translate text into other languages, check your spelling or grammar, or spruce up the way your browser looks. You’ll find these and thousands of other free extensions at addons.mozilla.org.