Full code changes: https://github.com/Aris-t2/CustomCSSforFx/commits/

Changelog:

[Appbutton]

• (tweak) appbutton popup > menu icons

[Buttons]

• (fix) Fx133-141+: back/forward buttons > connected to location bar
• (tweak) buttons on navigation toolbar classic appearance
• (tweak) buttons on navigation toolbar classic appearance v2
• (tweak) buttons on navigation toolbar dark appearance
• (tweak) buttons on navigation toolbar glass appearance
• (tweak) buttons on navigation toolbar osx appearance

[General UI]

• (tweak) popup compact menus
• (tweak) popup menus space before label
  • previous Fx140+ option became dafault one
  • previous default one renamed to '_fx139'

[Tabs]

• (tweak) classic squared tabs
• (tweak) classic squared tabs australized
• (tweak) default tabs photon
• (tweak) default tabs photon alt
• (tweak) 'tab audio icon' option (thx to Speravir)

[Toolbars]

• (tweak) icons + text mode