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Firefox got uninstalled during a Thunderbird update by Mozilla Maintenance Service
Thunderbird got updated to 78.12.0 by Mozilla Maintenance Service this morning and I believe Firefox got uninstalled by accident during the process.
The reason I think it got deleted by MMS is because in `C:\Program Files\Mozilla Firefox` I could see a single file named `tobedeleted` and when I read the log located at `C:\Program Files (x86)\Mozilla Maintenance Service\UpdateLogs`, the last two lines were : NS_main: unable to remove directory: tobedeleted, err: 41 NS_main: directory will be removed on OS reboot: tobedeleted
Luckily my `%APPDATA%\Mozilla\Firefox\Profiles` were not affected by this issue and I managed to recover my data by reinstalling Firefox.