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🐞 Themes don't work anymore #3787
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BugBug or required update after YouTube changesBug or required update after YouTube changesgood first issueA GitHub standard for inviting (new) contributors *Congratulations in advance!*A GitHub standard for inviting (new) contributors *Congratulations in advance!*help wantedJust an old github standard we add automatically. (The team can remove it when working on it.)Just an old github standard we add automatically. (The team can remove it when working on it.)up-for-grabs(a github standard for inviting new contributors) - Welcome! ♥(a github standard for inviting new contributors) - Welcome! ♥
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BugBug or required update after YouTube changesBug or required update after YouTube changesgood first issueA GitHub standard for inviting (new) contributors *Congratulations in advance!*A GitHub standard for inviting (new) contributors *Congratulations in advance!*help wantedJust an old github standard we add automatically. (The team can remove it when working on it.)Just an old github standard we add automatically. (The team can remove it when working on it.)up-for-grabs(a github standard for inviting new contributors) - Welcome! ♥(a github standard for inviting new contributors) - Welcome! ♥
Concise Description
The theme is only applied to the header and scroll bar now
Browser/s
Chrome
Other Browser:
No response
'Steps to reproduce' - Which of our features is required for the bug to happen?
open youtube
Since when?
4/14/2026, apparently.
Does the bug still happen when you log out of YouTube?
None
..No? Then please paste your yt.config_.EXPERIMENT_FLAGS. Twice (With the error & Without)
No response
Are any errors or related log-messages shown in the Browser-Console? (F12)
No response
Tested as the only active extension? (incognito mode or another browser users):
None
Expected preferred behavior:
No response
ImprovedTube Version
No response
Your Settings (From the Extension's
⋮-Hamburger menu > Settings > Backup & reset > Export settings)No response
Your YouTube-Document
No response
OS / Device:
No response