Horizontal tab bar is not hidden and sidebar title overlaps web page

[bammerlaan]

I'm sure this is because I'm doing something weird, but on the latest version (v2-2025-01-07), Firefox' default horizontal sidebar isn't disabled. I had to add
#TabsToolbar-customization-target { visibility: collapse !important; }

to custom.css to get rid of them. Also, part of the webpage seems to be cut off, and the sidebar title overlaps it.

I tried installing on a fresh instance of Firefox developer edition as well, to see if any old settings of mine somehow caused it, but the same thing happened.

I'm using Firefox 134.0 on Arch Linux. Let me know if you need any more information.

[wizrdsh]

Yes, I noticed this yesterday after I did a rebuild of my machine.

The issue stems that the new sidebar implementation is only available in Nightly Firefox releases. I am likely going to be reverting this change and shifting it to a nightly branch until they release it to their primary releases.

[bammerlaan]

Ah, good to know it isn't me, then! Shame that it isn't available in the developer or stable branch yet—the nightly build seems a bit too bleeding edge for me to use.