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With Firefox 65, how do I have tabs placed below the address (URL) bar and not above?

Users of previous versions of Firefox have found that if they had tabs below the address bar, the upgrade to version 65 broke that: tabs appear above the address bar.

For Firefox 65 users who prefer to have tabs appear below the address bar, the procedure is described in Forum Response - Tabs below the URL bar

Firefox's style or appearance can be modified by creating a chrome folder inside your Firefox profile folder and then placing a userChrome.css file inside, that includes a custom style rule. The rules you put in the userChrome.css file will override the default styles in Firefox.

with this caution:

Custom style rules might not work every time because of other factors (such as incompatibility with other custom style rules) beyond the Mozilla community's control. Your custom style rule might also stop working each time a new Firefox release comes out.

On my system, this is the path to userChrome.css:

/home/dkb/.mozilla/firefox/prefix.suffix/chrome/userChrome.css

Both chrome and userChrome.css are case-sensitive.

The following lines needs to be placed in userChrome.css:

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");



/* TABS on bottom */

#navigator-toolbox toolbar:not(#nav-bar):not(#toolbar-menubar) {-moz-box-ordinal-group:10}

#TabsToolbar {-moz-box-ordinal-group:1000!important}



#TabsToolbar {

 position: absolute !important;

 bottom: 0 !important;

 width: 100vw !important;

}

#main-window:not([chromehidden*="toolbar"]) #navigator-toolbox {

padding-bottom: var(--tab-min-height) !important;

}

#tabbrowser-tabs {

  width: 100vw !important;

}

Save the file and restart Firefox.

Notes:

• If you already have content in your userChrome.css, the first line is probably already present and doesn't need to be repeated.


• You need to ensure that either the menu bar or the title bar or both are visible. If both are missing, the tabs on bottom will overlap and obscure your bookmarks bar and the minimize/restore/close buttons won't be displayed.

Firefox 65 with tabs below the address bar: