userChrome.css

/* last updated for ff 134 */
/* toolkit.legacyUserProfileCustomizations.stylesheets = true */

/* compact mode:
   browser.compactmode.show = true
   extensions.activeThemeID = [email protected]
   browser.uidensity = 1
   browser.tabs.inTitlebar = 0
*/

/* urlbar tweaks:
   browser.fixup.domainsuffixwhitelist.lan = true
   browser.urlbar.shortcuts.bookmarks = false   
   browser.urlbar.shortcuts.history = false
   browser.urlbar.shortcuts.tabs = false
   browser.urlbar.suggest.bookmark = false
   browser.urlbar.suggest.history = false
   browser.urlbar.suggest.openpage = false
   browser.urlbar.tipShownCount.searchTip_onboard = 4
   browser.urlbar.tipShownCount.searchTip_redirect = 4
   browser.urlbar.tipShownCount.tabToSearch = 60
   browser.search.suggest.enabled = false
   browser.newtabpage.activity-stream.topSitesRows = 2
   configure url speed dial by choosing top sites in ntp
   disable all but one search provider
*/

/* sideberry theming:
   #root.root {--toolbar-fg: #e8e8ea;}
   #root.root {--frame-fg: #b8b8ba;}
   #root.root {--tabs-normal-fg: #e8e8ea;}
   #root.root {--tabs-font: 0.8375rem sans-serif;}
   set density to compact, font to xxs
*/

/* hide sidebar header and make splitter thinner for tab center and sideberry */
#sidebar-box:is(
  [sidebarcommand="tabcenter-reborn_ariasuni-sidebar-action"],
  [sidebarcommand="_3c078156-979c-498b-8990-85f7987dd929_-sidebar-action"]
) {
  #sidebar-header {
    display: none !important;
  }
  + #sidebar-splitter {
    width: 1px !important;
  }
}

/* hide native tabs when sideberry visible */
#main-window:has(#sidebar-box[sidebarcommand="_3c078156-979c-498b-8990-85f7987dd929_-sidebar-action"]:not([hidden])) #TabsToolbar {
  display: none !important;
}

/* slim tabs */
:root {
  --tab-min-height: 24px !important;
}
#TabsToolbar {
  height: var(--tab-min-height) !important;
}
.titlebar-spacer[type="pre-tabs"] {
  display: none !important;
}

/* remove tab margins */
.tab-background[selected="true"] {
  background: var(--toolbar-bgcolor) !important;
}
.tab-background {
  border-radius: 0 !important;
  margin-top: 0 !important;
  margin-bottom: 0 !important;
}
.tab-content {
  margin-top: 0 !important;
  margin-bottom: 0 !important;
}
.tab-stack {
  margin-top: 0 !important;
  margin-bottom: 0 !important;
}
.tabbrowser-tab {
  padding-inline: 0 !important;
}

/* add a thin tab divider line */
.tab-content {
  border-right: .5px solid rgba(255,255,255,.05);
}

/* container tab context line fixes and visibility improvements */
.tabbrowser-tab .tab-context-line {
  margin-top: 0 !important;
  margin-left: 0 !important;
  margin-right: 0 !important;
  border-radius: 0 !important;
  height: 3px !important;
  opacity: 0.2;
}
.tabbrowser-tab[selected] .tab-context-line {
  opacity: 0.4;
}

/* hide tab close button for unhighlighted tabs unless hovering */
.tabbrowser-tab:not([visuallyselected="true"]):not(:hover) .tab-close-button {
  display: none !important;
}

/* click through sound icon for pinned tabs */
.tab-icon-overlay[pinned="true"][soundplaying="true"] {
  pointer-events: none !important;
}

/* no bottom border for address bar */
#navigator-toolbox {
  border-bottom: none !important;
}