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.

Does what it is written, but it just suddenly stopped working after the new FF update.

Edit: Thanks for the response, Dev. I am using Windows 11 21H2, FF 99.0.1 (64bit) I tried clean uninstall and reinstalling firefox, didnt work.

Does what it says it does, but the shortcuts are very confusing.

I cannot get the pause toggle to work with shortcuts, making the extension very annoying to actually use.

I wish it had hybrid upscale too.

Like upscaling the video to 18:9 and then stretching the result to fill up the whole screen. Right now stretch mode is hardly used.
The extension 'UltraWidify' does have this option though, but this extension is way more stable and performs a LOT smoother so I would like to see it here.

Works, but it doesn't have the upscale mode that I need. Upscale seems to fill the screen horizontally from edge to edge, but it can cut off the top and bottom of the video if it's too tall. I'd rather upscale fills the frame vertically, and leaves black bars on the side if it has to. The frame should never be cut off. This is an issue I noticed with Expanse on Amazon Prime. The aspect ratio seems to be non-standard.

Thanks Dev, works great.

Works great and I enjoyed it for months when I had a UltraWide but when I upgraded to a Samsung G9 that has a wider aspect it no longer works correctly. It would be really nice if you added support for other resolutions. Right now the only options I have are to not use the add-on, have a ridiculous stretch that is unwatchable, or have it cut inches off the top and bottom of the video. I just want it to fill the screen and leave the sides black so the Video is as large as possible on my screen without cutting anything off. Your screenshots show that I should use "Normal Mode" for this effect but that's not how your addon works, not even with a standard Ultrawide.

Works as expected and solves the annoying fact that Dinsey+ doesn't support ultrawide monitors.

downloaded, worked immediatley. That's all i wanted so 5 stars :)