Log Message:
firefox: Update to 84.0.1

Changelog:
Fixed

  * Fixed problems loading secure websites and crashes for users with certain
    third-party PKCS11 modules and smartcards installed (bug 1682881).

  * Fixed slower than expected performance and flickering on Canvas elements
    for some Windows users (bug 1683116).

  * Fixed a bug causing some Unity JS games to not load on Apple Silicon
    devices due to improper detection of the OS version (bug 1680516).

  * Fixed crashes caused by various third-party antivirus software.