topic Re: Pinned tabs disappear when vertical tabs are activated in FF 140 Nightly in Discussions

Pinned tabs disappear when vertical tabs are activated in FF 140 Nightly

Hugo_R — Thu, 15 May 2025 09:48:42 GMT

In FF 140 Nightly I have vertical tabs activated. When I pin more than one tab, only the first one remains visible, the others disappear and a tiny scroll bar appears for the pinned tabs in the vertical tab bar. I could manually move the divider line under the pinned tabs, but this does not stick when I close and re-open FF. This cannot be the desired behaviour of the browser, can it? Thank you for your help.

Re: Pinned tabs disappear when vertical tabs are activated in FF 140 Nightly

tate — Thu, 15 May 2025 13:40:54 GMT

This behavior has been acknowledged in Mozilla's bug tracking system. The issue, identified as Bug 1954990, notes that multiple pinned tabs in vertical mode can lead to a reduced or hidden normal tabs area. A fix was implemented and verified in Firefox versions 138 and 139 . However, it seems that similar or new issues have emerged in version 140, particularly when the "Enable sidebar on hover" feature is activated.
One thing u can do is disabling the "Enable sidebar on hover" option in the sidebar settings. This can help maintain the visibility of pinned tabs without the scrollbar jumping behavior.

Re: Pinned tabs disappear when vertical tabs are activated in FF 140 Nightly

Hugo_R — Thu, 15 May 2025 15:21:24 GMT

Thanks, tate, for your reply. However, "Enable sidebar on hover" is not and has not been enabled. I attach a screenshot of my vertical sidebar. Notice the tiny scroll bar to the right of the attached Gmail tab. There are actually two pinned tabs, but only the first one is visible. I'd have to scroll down to see the second one.

Re: Pinned tabs disappear when vertical tabs are activated in FF 140 Nightly

Walkerq — Fri, 16 May 2025 00:18:13 GMT

As a temporary workaround, you might consider adjusting the size of the vertical tab sidebar to ensure all pinned tabs are visible. However, this adjustment may not persist across sessions. Alternatively, you can monitor the progress of Bug 1954692 for updates on a permanent fix.

Re: Pinned tabs disappear when vertical tabs are activated in FF 140 Nightly

Hugo_R — Fri, 16 May 2025 08:13:12 GMT

Thank you for your suggestion. You are right, though, it does not persist across sessions. I hope the bug will be fixed soon.

Re: Pinned tabs disappear when vertical tabs are activated in FF 140 Nightly

chrislerch — Sun, 18 May 2025 16:22:43 GMT

Same for me. Pinned tabs should wrap when you adjust the sidebar size. But now they don't wrap at all and the ones on the end disappear when the sidebar is adjusted.

Re: Pinned tabs disappear when vertical tabs are activated in FF 140 Nightly

tinylazer — Sun, 20 Jul 2025 01:27:31 GMT

This only happens if "Enable sidebar on hover" is selected in 140.0.1 Linux build. Disabling the option shows the pinned tabs side-by-side.