"Temporarily allow all this page" button gone

[as64]

Subject basically says it all. The "Temporarily allow all this page" button is gone for me on one of my computers. No clue what happened to it but I really need it back. I looked through the general help topic and tried hitting reset in options, disabling the add-on and removing/reinstalling the add on, still missing. Any clue what could be causing it? Just to be clear all the other buttons are still there.

[barbaz]

tried hitting reset in options, [...] removing/reinstalling the add on,

Either of those should have restored all the buttons and put them in default layout. You might have a corrupt Firefox profile, in which case try to transfer only your important data to a new profile - https://support.mozilla.org/en-US/kb/re ... ld-profile

BTW why are you still using Firefox 79, which is outdated and has many publicly-known security vulnerabilities?