Firefox is popular in part because it allows anyone to extend the browser with all sorts of additional functionality through its add-on framework. Add-ons can turn Firefox into a BitTorrent client, an ...

The misbehaving Firefox add-ons were misusing an API that controls how Firefox connects to the internet. Mozilla’s Firefox team has blocked add-ons that were abusing the proxy API in order to prevent ...

Old XUL-based Firefox extensions built on the ancient Add-ons SDK will stop working when Mozilla releases Firefox 57, scheduled for the end of 2017. Only add-ons built on the new WebExtensions API ...