Fun fact: the cork stopper in a cask, keg, or barrel is called a bung. The hole into which it is inserted is called a bunghole.
Bunghole is also a euphemism for anus. So, a question for any morticians here: can we start calling the corpse plug a bung? I’d consider a career change if I got to tell people about the bung in grandpa’s bunghole.
While I can appreciate and support the MS hate, I should probably point out that the Firefox.exe.sig file is a normal part of a Firefox install, it is not the exe, it did not get renamed or encrypted. It’s likely Firefox was in the middle of an update when your system crashed.