I like it, it makes multitasking easier. It works perfectly fine on Firefox.

I just wish that it would also work on Opera GX. Everytime I try to open it on Opera GX, it gives me this message:

m.youtube.com is blocked
m.youtube.com refused to connect.

ERR_BLOCKED_BY_RESPONSE

I want to love this application, it seems like it would be very handy. I love what you guys have done with it. Once I figured out how to set it to the mobile site, however, I began getting blank white screens. It would load, I'd see the home page, then before I could do anything it would go blank. I hope to see this glitch fixed, because this is a pretty useful feature.

No icon appears on the firefox browser bar so I cannot use the extension.

Mobile view gave me a blank page, desktop view simply does not fit in a sidebar

It works well, when it works. I am using Firefox 57 and am constantly getting a weird one-second video loop effect. The audio plays fine though. Reloading the sidebar doesn't seem to fix it. Restarting the Brower does. Using the full youtube site doesn't have this issue at all.