It just does not work at all anymore. YouTube ignores the default resolutions you set and it ignores the auto-pause feature too. It's really not the authors fault, YouTube's constant updating has made it very hard to keep addons that deal with it up to date and functional. Plus a lot of the things we used to be able to do with YouTube via basic web extensions are just not possible anymore.

USED to be really good..... Now doesn't allow me to play videos without disabling it completely. I like the Auto Pause option but now have to enable default play behavior just to watch videos.... which kind of defeats the purpose of this extension really..... Please make the effort to fix this as I'm not the only person complaining about this!! (Been this way for months now!)

Don't work. Youtube ignore settings like resolution + Miss some settings

Doesn't work on android

This add stops YouTube video's playing embedded on websites that have them, so you are forced to click the view on YouTube link that opens a new window, you can not view it on the website...

I rely on Verizon cellular for my internet, so my purpose for this plugin is to reduce video quality to the standard that VZW's pitiful network will bear. This plugin used to help me to that end, but so far as I can tell it no longer has any effect and it has been quite some time, so I'm downgrading my rating to 1 or 0.

Why the hell my resolution automatically changes to 720p when I have set medium quality? This add-on definitely doesn't work all the time.
Please take care of it.

não tem como usar, com a extensão habilitada os vídeos ficam travados

Was having issues with numerous bugs, but it still at least did what the name says. Tried deleting it's "storage.js" preferences file from my Firefox profile folder in an attempt to fix it and now it doesn't even work at all.

Firefox 56.0.2 sometimes videos on youtube will not unpause if auto-pause is set. Each time i click the video it unpause-repauses. Closing firefox does not fix it.

Does not work out of the box on linux debian stretch.

58.0.2
cannot auto highres

not working !

Does not working to Firefox Quantum 58.0.2

Earlier this has been fantastic. Now for a long time it just plain and simply doesn't work. Resolutions are always on auto, video speed is always on x2 (though they still play normal speed). I, really, hope this will get fixed soon...

In YouTube settings, web browser or app, you can set it to automatically use the highest definition. If it doesn't work for you, than you have bad/slow internet. This Add-on is ridiculously unneeded, especially if you know how to use a computer.