[BUG] Vertical Line Appears on Tab Bar When Multiple Tabs Are Open

[crucinal1]

What happened?

In Firefox version 130.0.1 (also in 131), there is a visual bug. When multiple tabs are open and the user is currently focused on the last tab, a vertical line appears on the left side of the tab bar. This line sometimes appears in the foreground, while at other times it remains in the background.

Steps to reproduce

1. Open lots of tabs
2. Scroll to the end or open last tab
3. The line appears on the left

Additional info (Optional)

No response

[kbc8090]

Yeah i tried for awhile to fix that and couldnt figure it out, it's only specific to the chrome-refresh option. The line is fine but I couldnt get the content behind to line up behind it, think it could be z-index related but I tried all kind of margin/padding things to fix to no avail.

[edelvarden]

This issue will be fixed in future Firefox releases. I don't see this issue in versions 132 (Dev) and 133 (Nightly).