Hiding Sidebar Panel Title

[arpena]

After updating to Firefox 140.0, with native vertical tabs enabled, the sidebar got its ugly title again.

None of the proposed customizations of userChrome.css hides it. I've found that the new sidebar is called sidebar-panel, so the following snippet in userChrome.css does the trick:

#sidebar-panel-header { display: none !important; }

Could someone add it to the wiki?

[piroor]

Now the header is a part of a sidebar panel, not a part of the browser window itself. How about putting the code to the userContent.css?

After some trial this works for me with the userChrome.css (not userContent.css).

*|sidebar-panel-header {
  display: none !important;
}

[PeterJCLaw]

Any ideas how to make this only hide for TST?