1855004 - Tabs flickering when window is at the right width

Status: RESOLVED INCOMPLETE

(Firefox :: Tabbed Browser, defect)

Description

[nullpointeracception]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/115.0

Steps to reproduce:

Have a few (8) pinned tabs and a many (17) regular tabs.

Actual results:

When the window is in a certain width range, resizing tabs influence each other and begin to oscillate/flicker.

Resizing out of that range (either narrower or wider) stops the flickering. If you go back so they become the critical width, it starts again.

In this flickering state, it almost impossible to click the tab you want because they're changing so quickly.

At first I thought it was an extension's fault and expected it to stop when disabling it, but it continued.

Expected results:

That tabs should resize smoothly and not flicker.

Comment 1

[nullpointeracception]

Attachment: tab-flicker.mp4

A screen recording showing the flickering

Comment 2

[Hani Yacoub, Desktop QA]

I can't manage to reproduce this issue on my end. I tried on macOS 11.6 and macOS 10.15.
Could you please try if the issue occurs in safe mode. Here is a link that can help you do that: 
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode

Comment 3

[nullpointeracception]

No, it does not seem to occur in safe mode.

Comment 4

[Dão Gottwald [:dao]]

Hey, nullpointeracception! Could you please copy your about:support information and paste it into this bug? Also, do you happen to know if your profile has a userChrome.css enabled?

Comment 5

[nullpointeracception]

I'm sorry. That was quite long ago. Definitely a different browser version and probably different settings.

I'm afraid I can't provide useful data for it anymore. I guess it's OK to close.

Comment 6

[Mike Conley (:mconley) (:⚙️)]

Thanks, nullpointeracception.