Mozilla Firefox will soon block the injection of DLLs by antivirus applications and other third-party programs in an effort to improve stability, security, and privacy.
Antivirus applications on Windows and other third-party applications, e.g. other security software or PDF tools, may inject DLLs in the browser. These injections are known to cause stability issues for users.
Mozilla follows Google which started to block third-party code injections in Google Chrome in 2018. Google discovered that Chrome installations with third-party DLL injection crashed 15% more than Chrome installations without.
Mozilla started to investigate options to disable DLL injections in Firefox in the fourth quarter of 2016 but things picked up speed only recently.
Firefox Nightly, the cutting edge version of the Firefox browser, blocks DLL injections already. The feature will be integrated in Beta and Release versions of the Firefox browser when they hit version 66.