[Bug] Shrink sidebar until hovered of userChrome.css after FF 133

[marrak]

Abstract

After upgrade of Firefox from 132.0.2 to 133.0 Shrink sidebar until hovered does not work

Steps to reproduce

1. Start Firefox with clean profile.
2. Install TST.
3. Use userChrome.css
   /* Shrink sidebar until hovered, when using Tree Style Tab. */
   :root {
   --thin-tab-width: 1px;
   --wide-tab-width: 100px;
   }
   #sidebar-box:not([sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"]) {
   min-width: var(--wide-tab-width) !important;
   max-width: none !important;
   }
   #sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] {
   position: relative !important;
   transition: all 100ms !important;
   min-width: var(--thin-tab-width) !important;
   max-width: var(--thin-tab-width) !important;
   }
   #sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"]:hover {
   transition: all 200ms !important;
   min-width: var(--wide-tab-width) !important;
   max-width: var(--wide-tab-width) !important;
   margin-left: calc((var(--wide-tab-width) - var(--thin-tab-width)) * -1) !important;
   }

Expected result

Tree is properly shrinking

Actual result

Tree is not visible at all (only tool tips of cards can be seen)

Workaround

Changing
margin-left: calc((var(--wide-tab-width) - var(--thin-tab-width)) * -1) !important;
to
margin-left: -1px !important;

alt least shows tab, but works hard :/

Environment

• Platform (OS): Win10
• Version of Firefox: 133.0
• Version (or revision) of Tree Style Tab: 4.0.25

[piroor]

userChrome.css compatibility issue is Firefox side problem and out of purpose of the issue tracker, so I've moved this to the discussions.

[seqizz]

Thanks for the hint, I was very confused.

For me the problem was that the z-index was changed, so even though sidebar was expanding, I was not able to see the parts which was expanding. Adding z-index: 999 !important; into #sidebar-box section solved it.

[dlechuga]

Check out the code snippets from the Wiki, the recommended Auto hide theme seems to be working fine with Firefox 133.0, it looks like the issue is indeed a change with the z-index in the latest browser update.