[kroltan]

I'm not sure if this is still the case, but Youtube used to use WebComponents v0 which has to be emulated in JS in non-Webkit browsers, since only Google ever implemented v0, while everyone else agreed it required a bit more work, and other engines run v1 instead, which is not compatible.

[konart]

Youtube was updated to the v1 quite some time ago with a fresh Polymer version

>Polymer.version

3.4.0

Polymer uses v1 WCs since Polymer v2

[kroltan]

Thanks! I had no idea how to check if it was still the case.

[chrismorgan]

The main YouTube site seems to still be lousy in Firefox. Buttons that should open dropdowns (e.g. the top right corner user icon and notifications icon) don’t. If I want to actually see notifications, I need to tack ?disable_polymer=1 onto the URL and experience the ancient site!

YouTube Studio doesn’t suffer from these problems.

[kroltan]

Hmm, seems to work fine for me.

[chrismorgan]

I have no idea when it stopped working, because I scarcely ever used the affected buttons until very recently—I have a vague feeling it might have worked three or four years ago, but in the last couple of months it’s definitely not been working for me.

uBlock Origin is the only extension that I have that could feasibly alter anything, and all it’s doing is blocking googleads.g.doubleclick.net. Nothing of interest shows up in the dev tools. 99.9% sure the bug is with YouTube, though in what particular way I cannot guess.

[skykooler]

I can confirm that uBlock Origin blocks the notification dropdown on Firefox. Does the dropdown get served by the ads server?

[chrismorgan]

Ah hah! Figured it out: some cosmetic filter is killing the dropdowns. Unfortunately the effecting rule is not discernable in the dev tools, so figuring out which rule is at fault is tricky and slow.

Found which one, too: it was a rule of my own that I added almost a year ago to kill off some of the annoying cards they pop up at the ends of many videos, which hide the video content; turns out my rule was just a touch too broad for how they do things.

Mea culpa.

[skykooler]

Aha! In my case it was a filter I added to block the "Upgrade to YouTube Red" banner that kept coming up even after I clicked "No thanks".

[kroltan]

I use uBlock (and some others) and have no problems clicking either buttons