Windows 10 (version 1709+), Windows Server (version 1803+) and Windows 11 come with a security feature named Exploit protection. Exploit protection includes a number of mitigations from the Enhanced Mitigation Experience Toolkit (EMET) which reached end of support on July 31st, 2018.
While you can apply those mitigations to Firefox (i.e. firefox.exe), Mozilla recommends keeping the default settings of Exploit protection for firefox.exe. Since Microsoft can change the mitigation techniques at anytime, you may experience compatibility issues such as startup or sudden crashes or loss of functionality if you were to update from a working version.
Known issues in older versions
- Firefox had a startup crash due to the compatibility issues with EAF (Export Address Filtering) until version 73.
- Bug 1587642 (fixed in 72)
- Bug 1592486 (fixed in 74)
- Firefox had a startup crash due to the compatibility issue with EAF+ until version 77.
- Bug 1509748 (fixed in 78)
- Firefox fails to load any pages with outdated Exploit Protection settings.
- Bug 1770098 (Fixed in 102)