[Proton] Broken vertical alignment of tabs label

[ErranticSam]

Describe the bug

I just installed Firefox UI Fix on my fresh new W10 OS, but I encounter an issue on the vertical alignment of tabs label (see Screenshots).

Expected behavior

I expected the tabs label to be centered horizontally and vertically.

Screenshots

OS

Windows 10

OS - Others

No response

Firefox Version

v116.0.3

Distribution

• Original Lepton
• Lepton's photon style
• Lepton's proton style

Theme

• Light
• Dark
• Alpenglow (System: Light)
• Alpenglow (System: Dark)
• System Default
• Others: (e.g. Photon Colors, Google Chrome Dark, Fairytale Of Nature)

Theme - More Info

Beautiful Alpen Blue : https://addons.mozilla.org/fr/firefox/addon/beautiful-alpen-blue/

user.js setup

user.js setup

// Just uncommented these 3 lines 
user_pref("userChrome.centered.tab",                        true);
user_pref("userChrome.centered.tab.label",                  true);
user_pref("userChrome.centered.urlbar",                     true);

Additional context

No response

[black7375]

For memo: In xul.css The attributes with the !important should be bypassed.

[black7375]

Try to v8.1.0 or latest commit please.
It will be works well.