Hiya! This may be a stupid question, but I'm truly at my wits end here. I'm on the latest version of Firefox, & for some reason pressing "F" doesn't toggle fullscreen on videos. I've tried plenty of extensions, ones even claiming to do just that with Firefox's built-in HTML5 Media Player, but without any luck. The only extensions I really use on e6 is good ol' Re621 & "e621 Thumbnail Enhancer 2", both on the latest version of Tampermonkey. The only one I've found that kind-of works is built-in to Re621, but that just opens the video in a separate environment from the website, not putting the video in real fullscreen, I'm looking for something like how YouTube does it; Just press F & the videos in actual fullscreen, press it again & it exits out of it. Does anyone here know of an extension that does what I'm looking for? Any & all help is appreciated; Thanks in advance.