We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox userChrome.css - Hide address bar

  • 3 replies
  • 1 has this problem
  • 1 view
  • Last reply by serhumanos

more options

Hello! I am using the userChrome.css file to hide the nav bar (# nav-bar) and show it when hovering the tabs.

The following code works a bit, but when I open the developer tools they overlap.

# nav-bar {
   z-index: -1;
}

# navigator-toolbox: hover # nav-bar {
   z-index: 1;
   background-color: rgba (0,0,0,0.8)! important;
}

#browser {
   margin-top: -45px;
}

Any advice to achieve the expected functionality? Thank you

gif showing the problem: https://s10.gifyu.com/images/firefox-customization-problem.gif

Hello! I am using the userChrome.css file to hide the nav bar (# nav-bar) and show it when hovering the tabs. The following code works a bit, but when I open the developer tools they overlap. <pre> # nav-bar { z-index: -1; } # navigator-toolbox: hover # nav-bar { z-index: 1; background-color: rgba (0,0,0,0.8)! important; } #browser { margin-top: -45px; } </pre> Any advice to achieve the expected functionality? Thank you gif showing the problem: https://s10.gifyu.com/images/firefox-customization-problem.gif
Attached screenshots

Modified by serhumanos

Chosen solution

thanks to @jscher2000 for his hint, In reddit-firefoxCss I got the code

https://www.reddit.com/r/FirefoxCSS/comments/rcogwz/comment/hnzf5rg

#nav-bar {
  /* customize this value. */
  --navbar-margin: -44px;

  margin-top: var(--navbar-margin);
  margin-bottom: 0;
  z-index: -100;
  transition: all 0.3s ease !important;
  opacity: 0;
  background-color: rgba(0,0,0,0.8) !important;
}

#navigator-toolbox:focus-within > #nav-bar,
#navigator-toolbox:hover > #nav-bar
{
  margin-top: 0;
  margin-bottom: var(--navbar-margin);
  z-index: 100;
  opacity: 1;
}
Read this answer in context 👍 0

All Replies (3)

more options

(sorry I don't know how to delete this "answer")

Modified by serhumanos

more options

Hi, you can use &ltpre> before and </pre> after your CSS to avoid the forum mistaking it for wikitext.

Probably you need to inject some padding at the top of the dev tools and just waste that space. A good site for advanced CSS tweaking is https://www.reddit.com/r/FirefoxCSS/

more options

Chosen Solution

thanks to @jscher2000 for his hint, In reddit-firefoxCss I got the code

https://www.reddit.com/r/FirefoxCSS/comments/rcogwz/comment/hnzf5rg

#nav-bar {
  /* customize this value. */
  --navbar-margin: -44px;

  margin-top: var(--navbar-margin);
  margin-bottom: 0;
  z-index: -100;
  transition: all 0.3s ease !important;
  opacity: 0;
  background-color: rgba(0,0,0,0.8) !important;
}

#navigator-toolbox:focus-within > #nav-bar,
#navigator-toolbox:hover > #nav-bar
{
  margin-top: 0;
  margin-bottom: var(--navbar-margin);
  z-index: 100;
  opacity: 1;
}