Works perfectly fine on Firefox Android, just as perfect as the Chrome extension. However,it would be Great if you can actually add it as a Mobile version so it will be listed for everyone, cause in order to use this on Android, people need to create an Account and then import it to an collection.

Doesn't work with 32:9 Monitors in Youtube.

Hey, this works with Viki and widescreen monitor! Thanks so much!

Not great. It just zooms in, doesn't really fix the aspect ratio and doesn't work with a 32:9 monitor. Crops everything on top and bottom with wider monitors. Can see it working well with 21:9 ones though. Giving it 3 stars because I can see it working for most peoples' monitors.

Does the job and gets rid of those black bars! You lose a bit of image from setting it to your aspect ratio and stretch makes things a little fat but this is only noticeable on my 21:9. It's a good add-on that I like and can change through the settings. Thanks!

The player needs a button that skips 1:30 sec ahead, for all the anime lovers out there! Upvote!

works at Disney+

all works as expected. If there's anything I miss it would be the additional button in youtube controls that switches on/off the zooming (something like extended youtube UI of Enhancer for YT)

First it didn't work at all. Then I checked a link the dev posted as reaction to a 4-star-review and added "--disable-direct-composition-video-overlays" to firefox-command in terminal (using Linux). Works like a charm now. Thanks!

Edit: stopped working again after switching to another tab. hmm...
Edit2: Figured it out, it only works in actual fullscreen, not F11. Then even without the added line. Dumb me ^^

Doesn't support my 5120x1440 monitor. If it did, it'd be perfect, but as of now I can't use it. A bug was filed and closed by the author, so if you have a supported resolution you'll probably love this extension, but if you don't it will crop the top and bottom of videos in upscale mode :(

When it works, its great! But lately Ive had trouble with 4:3 videos (or anything less then 16:9), and randomly it disables its self, or changes what mode its in.

Simply is not doing anything in Youtube.

flawless, works instantly after page refresh! rad!

This doesn't work at all on Hulu sadly, needs an update for the latest firefox version and testing with multiple streaming platforms as well.

UPDATE: It works! Just had to refresh webpage after installation.

Good job!

Real easy to use, works like a charm. Weird that Disney doesn't fix this themselves.