Seek bar not red for played/location

[jamesdeluk]

With SB, no hover:

With SB, with hover:

Without SB, no hover:

Without SB, with hover:

Any idea why this is?

If there are no sponsor segments, the red appears as normal.

Latest version of Firefox on Windows 11.

[ajayyy]

Can you try disabling other extensions as well?

[jamesdeluk]

I disabled all other extensions, but it still happens.

I've also noticed it doesn't happen every time; more times than not the bar is grey, but occasionally it's red. I can't figure out the common reason though. It can happen on the same video after reloading a few times, for example.

[jamesdeluk]

Saw something interesting today. Sometimes some of the sections are red - perhaps those in the past?

But not always:

(same video)

[chk1]

This video has the same issue that OP describes, no red color in the elapsed part, no matter how many times I refresh: https://www.youtube.com/watch?v=w5txssFShY8

Youtube today switched me to a new desktop design, which can be identified by the gray header bar and seek bar color that turns slightly pink towards the end. May or may not be related to this, I've not seen any other videos that have this issue yet.

My other Youtube addons are Return Youtube Dislikes and uBO, which do not affect the behaviour, but I can reproduce it by disabling Sponsorblock. When I resize my browser window, and the player redraws some UI (?), the red color re-appears sometimes.

Using Firefox 131.0.3, Sponsorblock 5.9.4

edit 2024-10-18

I compared two video players, the affected one has background-size set to 0px (compared to 33px on working ones) on chapters in the seek bar elements with the following class name hierarchy:

ytp-progress-bar-container > ytp-progress-bar > ytp-chapters-container sponsorBlockChapterBar > ytp-chapter-hover-container > ytp-progress-list > ytp-play-progress ytp-swatch-background-color

And I noticed that this video has custom chapters added by Sponsorblock (I didn't know this was a feature), while the working ones don't. The other video with custom chapters from the same channel is affected in the same way (https://www.youtube.com/watch?v=dvzzG8pfO1E)

If you watch the regular ad before the video and click Skip, the seek bar color is fine.

If you open a video with timestamp parameter ?t=x, or navigate to a video that you've partly watched, the seek bar color is fine.