Malicious Firefox Add-ons Block Browser From Downloading Security Updates

Mozilla on Monday disclosed it blocked two malicious Firefox add-ons installed by 455,000 users that were found misusing the Proxy API to impede downloading updates to the browser. The two extensions in question, named Bypass and Bypass XM, "interfered with Firefox in a way that prevented users who had installed them from downloading updates, accessing updated blocklists, and updating remotely