AddOn slowing down the loading of subscriptions page / thumbnails

[rastla]

Browser

Firefox

Browser Version

105.0.3

Extension or Userscript?

Extension

Extension/Userscript Version

3.0.0.6

Video link where you see the problem

https://www.youtube.com/watch?v=OoQLoKHhohg

What happened?

If you load your subscriptions page: https://www.youtube.com/feed/subscriptions
Or really any video page: https://www.youtube.com/watch?v=OoQLoKHhohg
Then the site will hang for 1-2 seconds while the thumbnails are still not loaded (or shown). After those 1-2 seconds YouTube continues loading and everything works fine (till you click on the next video or so).

Disabling the "Return YouTube Dislike" Extension solves the problem.

How to reproduce/recreate?

load your subscriptions page: https://www.youtube.com/feed/subscriptions
Or really any video page: https://www.youtube.com/watch?v=OoQLoKHhohg

then see that hangs for a few seconds like this: https://i.imgur.com/rSlUEDS.png
then it loads normally (until you click on a video and it loads the thumbnails there)

Will you be available for follow-up questions to help developers diagnose & fix the issue?

Yes

[rastla]

sorry, issue is apparently the Facebook container addon: mozilla/contain-facebook#884