Firefox CSS

For years, I've used a CSS trick to move my window controls (Minimize, Fullscreen, Close) from the Menu Bar into the lower toolbar, right beside my Overflow menu. (I'm on Windows 10, so these are the controls you see in the upper right window)

But suddenly, that doesn't work. My window controls are back up in the Menu Bar. That's unfortunate, because I usually hide my Menu Bar.

Can anyone review my code and tell me what needs to change? Thank you!

/* Move Window Control buttons to Nav Bar */

:root:is([tabsintitlebar], [sizemode="fullscreen"]) {
  --uc-window-control-width: 138px; /* Space reserved for window controls (Win10) */
  /* Extra space reserved on both sides of the nav-bar to be able to drag the window */
  --uc-window-drag-space-post: 30px; /* right side*/
}

:root:is([tabsintitlebar][sizemode="maximized"], [sizemode="fullscreen"]) {
  --uc-window-drag-space-pre: 0px; /* Remove pre space */
}

@media  (-moz-platform: windows-win7),
        (-moz-platform: windows-win8),
        (-moz-os-version: windows-win7),
        (-moz-os-version: windows-win8){
  :root:is([tabsintitlebar], [sizemode="fullscreen"]) {
    --uc-window-control-width: 105px;
  }
}

@media (-moz-gtk-csd-available) {
  :root:is([tabsintitlebar],[sizemode="fullscreen"]) {
    --uc-window-control-width: 84px;
  }
}

.titlebar-buttonbox, #window-controls{ color: var(--toolbar-color) }
:root[sizemode="fullscreen"] .titlebar-buttonbox-container{ display: none }
:root[sizemode="fullscreen"] #navigator-toolbox { position: relative; }

:root[sizemode="fullscreen"] #TabsToolbar > .titlebar-buttonbox-container:last-child,
:root[sizemode="fullscreen"] #window-controls{
  position: absolute;
  display: flex;
  top: 0;
  right:0;
  height: 40px;
}

:root[sizemode="fullscreen"] #TabsToolbar > .titlebar-buttonbox-container:last-child,
:root[uidensity="compact"][sizemode="fullscreen"] #window-controls{ height: 32px }

#nav-bar{
  border-inline: var(--uc-window-drag-space-pre,0px) solid var(--toolbar-bgcolor);
  border-inline-style: solid !important;
  border-right-width: calc(var(--uc-window-control-width,0px) + var(--uc-window-drag-space-post,0px));
}

:root[tabsintitlebar]{ --uc-toolbar-height: 40px; }
:root[tabsintitlebar][uidensity="compact"]{ --uc-toolbar-height: 32px }

#TabsToolbar{ visibility: collapse !important }

:root[sizemode="fullscreen"] #TabsToolbar > :is(#window-controls,.titlebar-buttonbox-container){
  visibility: visible !important;
  z-index: 2;
}

:root:not([inFullscreen]) #nav-bar{
  margin-top: calc(0px - var(--uc-toolbar-height,0px));
}

:root[tabsintitlebar] #toolbar-menubar[autohide="true"]{
  min-height: unset !important;
  height: var(--uc-toolbar-height,0px) !important;
  position: relative;
}

#toolbar-menubar[autohide="false"]{
  margin-bottom: var(--uc-toolbar-height,0px)
}

:root[tabsintitlebar] #toolbar-menubar[autohide="true"] #main-menubar{
  -moz-box-flex: 1;
  -moz-box-align: stretch;
  background-color: var(--toolbar-bgcolor,--toolbar-non-lwt-bgcolor);
  background-clip: padding-box;
  border-right: 30px solid transparent;
  border-image: linear-gradient(to left, transparent, var(--toolbar-bgcolor,--toolbar-non-lwt-bgcolor) 30px) 20 / 30px
}

#toolbar-menubar:not([inactive]){ z-index: 2 }
#toolbar-menubar[autohide="true"][inactive] > #menubar-items {
  opacity: 0;
  pointer-events: none;
  margin-left: var(--uc-window-drag-space-pre,0px)
}

Personally I'm pretty frustrated with the way it works. I've noticed all of the following , and at least some of these apply to dev tools too. I don't like the way Google controls the internet with Chrome, but at least its dev tools just work.

• Sometimes when I try to use the element picker tool it actually clicks the element instead of selecting it in the toolbox
• I can't change selectors in CSS files in the sidebar, I have to go the style editor (Chrome lets me do this)
• I can't easily copy HTML attributes, if I double click on an attribute, the text is selected but when I press CMD C, it copies the entire tag with all of its attributes.
• A lot of the time CSS properties I write just don't apply and isn't crossed out. Its like it just has a hard time doing that.

Firefox's CSS just feels very dirty, like its very tricky to figure out how to best change this or that element because of how many moving parts there are between state changes (like :hover) and how variables interoperate. And in some places to make a single change you have to change multiple variables, like if you want to change the height of the URL bar row.

I've spent many hours on the CSS, and each time I revisit it, I find that I could've wrote this or that better, and I looked for variables that the UI uses, and wonder why I didn't find them the first time. I've been writing CSS on and off for 8 years now, I wonder if I'm just bad it since I've never done web dev full time, or it's actually a lot of work to write good CSS.

elements like the previous tab, next tab, and reload buttons? I've been using SVG images for them and I know you can either do that or embed the SVGs right in with a url(), but I wonder if anyone has found a workaround for using text, with or without psuedo-elements, like using content in a :before() element.