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I was surprised. I installed it as an afterthought while working on a separate CDM issue and really didn't have any expectations.
I'm not picky about video, but the improvement was very apparent.

Very good Add-on
It would be good if there is option to turn off video (aka Audio only).

Saved me from ads... thanks a lot Dev

No need to access data for all websites.

more like, YouTube Low Definition

Excelente

Nice Extension For Viewing Hd video and Low Mode always select you want select.

Actually not compatible with Firefox Fenix Mobile+m.youtube.com.

Choosing Quality eventually cause Video keep restarting on start. Maybe Youtube try to force it Auto Detect in same time. This issue seem not happen if we use Youtube Desktop site.

The others options just don't work on Youtube Mobile view. Autoplay options also probably won't necessary anymore, as Firefox Fenix has it Built-in by now (though seem not perfect).

Messes up theater mode making videos too tall for the window.