Edit C:\Users\Admin\AppData\Roaming\Mozilla\Firefox\Profiles\2de66b35.default\compatibility.ini
[Compatibility] LastVersion=86.0.1_20210310152336/20210310152336 LastOSABI=WINNT_x86_64-msvc LastPlatformDir=C:\Program Files\Mozilla Firefox LastAppDir=C:\Program Files\Mozilla Firefox\browser
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