2003875 - Tab hitbox does not extend to top of screen

Status: UNCONFIRMED

(Firefox :: Tabbed Browser, defect)

Description

[Raphael]

Attachment: tabbar.mp4

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0

Steps to reproduce:

Removed userChrome.css
Open tabs on any sites.
Restart window with keep tabs enabled.
Maximize window.
Move cursor to a tab to switch. From the bottom into the tab until cursor hits screen edge.

Actual results:

When the cursor is moved from the bottom into the tab then hits the screen top edge, the tab is still highlighted but not clickable.
This is also reproducible for the "new tab" button.
Clicking the tab did not cause firefox to switch to it.
I have to carefully position the cursor to not overshoot the hitbox.
This does not happen on all windows. (see attached file)

Expected results:

The click should have still opened the new tab. The hitbox of any tab (and other tab bar element) should expand to the top screen edge when the window is maximized.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Firefox::Tabbed Browser' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Monica Chiorean]

I am not able to reproduce the issue on Win11 using Firefox build 146.0.
Also does this also happen with a new and empty profile? See https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems#w_6-create-a-new-firefox-profile
Thank you.

Comment 3

[Raphael]

Hey, yes I did replicate it in a fresh profile.

Some more detail to reproduce:
I have 2 screens with different resolution (1080p and 1440p).

To cause the issue I create fresh profile and launch it.
Enable "Open previous windows and tabs".
Create second window, One window maximized on each monitor.
Fill both with new tabs until they start to scroll.
Close all windows with Burger Menu-> Exit (Ctrl+Shift+Q).
Relaunch profile.
Tabs are now bugged on one of the monitors. Its not always the same one.

Comment 4

[Raphael]

https://bugzilla.mozilla.org/show_bug.cgi?id=2004139
Same issue there it seems.

The 147 beta did not fix my issues either.

Comment 5

[Raphael]

Seems to be fixed in 147b4 .

Comment 6

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:dwalker, could you have a look please?

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