The stuff I do

Auto hide firefox bookmark bar

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A very quick tip that I don't want to forget about: One can automatically hide the firefox bookmark bar, the bar will show when the mouse hovers the bottom of the navigation bar and hide after a defined delay.

Locate userChrome.css 🔗

The userChrome.css file holds style rules for modifying Firefox's user interface. This website is a good learning resource.

On linux the file is either in

To locate the profile currently used by Firefox one can visit about:support and check the line Profile Directory.

You also have to set toolkit.legacyUserProfileCustomizations.stylesheets to true in about:config otherwise Firefox ignores userChrome.css

Add the relevant code 🔗

The code is available on MrOtherGuy's Github, I'm copying it as a reference. It works well with Firefox 87.0.

/* Source file made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */

  --uc-bm-height: 20px; /* Might need to adjust if the toolbar has other buttons */
  --uc-bm-padding: 4px; /* Vertical padding to be applied to bookmarks */
  --uc-autohide-toolbar-delay: 600ms; /* The toolbar is hidden after 0.6s */

  /* 0deg = "show" ; 90deg = "hide" ;  Set the following to control when bookmarks are shown */
  --uc-autohide-toolbar-focus-rotation: 0deg; /* urlbar is focused */
  --uc-autohide-toolbar-hover-rotation: 0deg; /* cursor is over the toolbar area */

:root[uidensity="compact"] #PersonalToolbar{ --uc-bm-padding: 1px }
:root[uidensity="touch"] #PersonalToolbar{ --uc-bm-padding: 7px }

  position: relative;
  margin-bottom: calc(0px - var(--uc-bm-height) - 2 * var(--uc-bm-padding));
  transform: rotateX(90deg);
  transform-origin: top;
  transition: transform 135ms linear var(--uc-autohide-toolbar-delay) !important;
  z-index: 1;

#PlacesToolbarItems > .bookmark-item{ padding-block: var(--uc-bm-padding) !important; }

#nav-bar:focus-within + #PersonalToolbar{
  transition-delay: 100ms !important;
  transform: rotateX(var(--uc-autohide-toolbar-focus-rotation,0));

#navigator-toolbox:hover > #PersonalToolbar{
  transition-delay: 100ms !important;
  transform: rotateX(var(--uc-autohide-toolbar-hover-rotation,0));

#navigator-toolbox:hover > #nav-bar:focus-within + #PersonalToolbar {  
  transform: rotateX(0);

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