Steps to reproduce

• Open Firefox in a new profile
• Install Sidebery
• Enable using userChrome.css
• Configure userChrome.css and sidebery like https://github.com/mbnuqw/sidebery/wiki/Firefox-Styles-Snippets-(via-userChrome.css)#dynamic-native-tabs

Actual behavior

When you open firefox 133 the tabs are not hidding when Sidebery is opened

Expected behavior

Firefox tabs should be hide when Sidebery is open.
After some research, I found that the #titlebar "selector" is removed from this version.
I tried to update the userChrome.css and get to a new version that is working for me, but I can't change or submit a PR to change the wiki.
All that it's need is to update the selector to .toolbar-items like the following snippet.

#main-window .toolbar-items {
    overflow: hidden;
    transition: height 0.3s 0.3s !important;
}

/* Default state: Set initial height to enable animation */
#main-window .toolbar-items {
    height: 3em !important;
}

#main-window[uidensity="touch"] .toolbar-items {
    height: 3.35em !important;
}

#main-window[uidensity="compact"] .toolbar-items {
    height: 2.7em !important;
}

/* Hidden state: Hide native tabs strip */
#main-window[titlepreface*="[Sidebery]"] .toolbar-items {
    height: 0 !important;
}

/* Hidden state: Fix z-index of active pinned tabs */
#main-window[titlepreface*="[Sidebery]"] #tabbrowser-tabs {
    z-index: 0 !important;
}

Please, note that I only tested on my machine and I'm no expert in CSS.

System

Xubuntu 22.04

Firefox version

133.0

Sidebery version

5.2.0

Logs

No response