Currently testing Nightly on Arch Linux, KDE Plasma + Kwin.
Upon testing my normal current theme (the official Pale Lavender theme) with the Title bar option, under my light theme, it- coincidentally, unfortunately- matched the Window decoration color perfectly, leading to a pretty pleasant seamless transition from the title bar into the background elements.
It’s nice, for once, seeing an application look like it’s designed to play nice with the system’s native window decorations- that hasn’t been a common occurrence since the Aero era.
Unfortunately, further testing proved it was very much just coincidental, as any dark browser themes didn’t match my custom system dark mode color palette.
I suggest, if possible, that there be an optional choice for having the panel gaps alone match the system’s color theming- whether the best choice be theme-defined or chosen in Firefox’s appearance settings, i’m unsure. Theme-defined would likely be the safe option, for backwards compatibility’s sake.
I think this is beneficial overall, not just for my strange use case (being one of 12 people who uses the Titlebar option) but for the user experience in general; having the application, regardless of theme, natively fall in line with the rest of the OS is a comforting feeling. The panel gaps remain visible, to the edge of the window, regardless of the titlebar option, and having it match up, subtle or not, would add an air of comfort and unity to Firefox alongside their other system-native programs.
I’m not a programmer, nor do i know the existing theming capabilities very well, but i know the browser already has the capacity to pull from the native window color scheme + icons, so it seems theoretically possible.
Thoughts?