This addon has taught me that nearly all web sites that supposedly aren't compatible with Firefox actually are compatible. I use this at work, on my android phone, and on my home PC as well. It's an essential addon, in my opinion, and I've had nothing but success.

Its great

Please update latest user agent on -UserAegntSwither

works great, so many populated presets already

Literal god-send. On Linux trying to get Windows .iso files for VM and because I'm on a desktop computer Microsoft in it's infinite need to control users does not allow the download of .iso files or even make it an option... unless you change the user-agent of course, then it's not a problem any longer. Saved me having to actually use my phone to do it again like last time. Nice work people!

Perfect extension that does exactly what it's supposed to do and what I need it to do, which is make YT work with FF and UBO without grossly slowing down actions due to Google's anti-competitive tomfoolery.

Unsure why so many people rate it so low. I assume they can't follow simple instructions to set it up or just didn't restart browsers after installed.