EvilPaul
EvilPaul
Found this issue and I believe this is the info you needed. I am using Firefox v72b7. Extension 4.4.2 
I think I had not refreshed the page after I clicked enable for the plugin on that page, it seems to be working for me, @MazelTovCocktail might want to try...
I think it might have been or nothing selected. I was trying a lot of settings and forget what it was originally, sorry.
Sorry for the delay. I tried again and on the same movie and I could not get it to work again. Pressing shortcut keys didnt do anything either.
Tried your suggestions with the new version and couldn't get it to work. I even uninstalled and reinstalled the plugin. I can't seem to change the size with keyboard shortcuts...
No worries, I understand it is a side project for you. Sorry but no luck for me :( I tried what you said a few times, I tried messing with...