In Firefox v87.0 GUI invisible

Recent Firefox v87.0 update broke this extension's ability to show GUI. Addon works invisibly, just without buttons.

Controller no longer shows (yes, I checked for HTML5), although it re-appears sometimes for no reason

Yes

Works like a charm.

great extesnion

Working great, but would recommend you include in the settings window guidance that the shortcuts are case-sensitive - I found that info on the readme in github, but until I did, I thought the shortcuts weren't working. Thanks much!

very useful extension for all videos. inclusion of keyboard shortcuts means no more fiddling with speed settings on every video

Works as intended and (usually) without any problems at all.

This is fantastic

This is the best speed controller extension I've used so far. Ever since I found it, I've never bothered testing new ones. New browser? Look for this extension, done.