[BUG] Youtube Studio video player

[vikingo12]

OS Windows 7

• Version: [e.g. 141.0.3]
• This is a r3dfox specific bug: YES
  Describe the bug
  Youtube Studio video player will literally vanish and won't be able to play video

To Reproduce
Steps to reproduce the behavior:

1. Go to Youtube Studio
2. Click on Edit Subtitles
3. Scroll down to Play Button
4. See error

Expected behavior
Nuked video player

Screenshots
This is on fork windows 7 firefox and official one

This is on r3dfox

Additional context
Literally r3dfox

[the-r3dacted]

I sent this in the previous issue and you never replied.

doesn't happen with that fork either, only r3dfox

Go to about:config, right click, new, string
Name: general.useragent.override.studio.youtube.com
Value: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0

See if that works

[vikingo12]

I sent this in the previous issue and you never replied.

doesn't happen with that fork either, only r3dfox

Go to about:config, right click, new, string Name: general.useragent.override.studio.youtube.com Value: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0

See if that works

My bad, I saw your comment about opening issue on new repo and did it without checking previous one

Doesn't work

[the-r3dacted]

I don't know what it could be then, r3dfox is a fork of e3k Firefox. I don't know why it would happen on r3dfox but not e3k Firefox.

[Vangelis66]

r3dfox is a fork of e3k Firefox.

... But between them, quite different buildconfig flags...

I don't know why it would happen on r3dfox but not e3k Firefox.

... One of many different about:config default values? I know (and appreciate 👍 ) that r3dfox is, by default, more privacy-oriented, however F4W7 has a close to stock Fx configuration...

@vikingo12, can you spot any Web Console errors when the YT player refuses to load/display?

[vikingo12]

r3dfox is a fork of e3k Firefox.

... But between them, quite different buildconfig flags...

I don't know why it would happen on r3dfox but not e3k Firefox.

... One of many different about:config default values? I know (and appreciate 👍 ) that r3dfox is, by default, more privacy-oriented, however F4W7 has a close to stock Fx configuration...

@vikingo12, can you spot any Web Console errors when the YT player refuses to load/display?

So when I press play button: HTTP load failed with status 403. Load of media resource [link] failed