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Tree Style Tabs is an excellent plugin and probably the main reason I use Firefox. With the newer versions of Firefox, Tree Style Tabs works nicely, but I can still see the same tabs duplicated across the top horizontally.

How can I hide the horizontal Tab Bar until Firefox incorporates this functionality?

Plugin Firefox Page: https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/
Plugin Homepage: http://piro.sakura.ne.jp/xul/_treestyletab.html.en

semtex41
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  • those with big screens might also like Tab Center Redux as it looks bigger then tree style tabs. – Vitas Jan 11 '18 at 20:07

1 Answers1

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The horizontal tab bar can be hidden with the following steps:

  1. Confirm or Create:
    Linux: ~/.mozilla/firefox/<profile name>/chrome/userChrome.css
Windows: %AppData%\Mozilla\Firefox\Profiles\<profile name>\chrome\userChrome.css
macOS: ~/Library/Application Support/Firefox/Profiles/<profile name>/chrome/userChrome.css
  2. Add the Following code to: userChrome.css
    @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
#TabsToolbar {
    visibility: collapse !important;
}
    ^Note: Line 1 is required when creating the file and does not need to be included more than once.
  3. Restart Firefox

As this is a custom workaround until either Firefox itself allows the horizontal tab bar to be hidden, or the TreeStyle Tabs extension itself hides it, this information may become dated in the future.

Confirmed Testing: Firefox Nightly 58.0a1 (2017-10-23) (64-bit)

As of Firefox 69: By default, userChrome.css modifications are disabled in Firefox. You need to make sure that on the about:config page in Firefox, the toolkit.legacyUserProfileCustomizations.stylesheets preference is set to true and then restart the browser. (see https://bugzilla.mozilla.org/show_bug.cgi?id=1541233)

EDIT: Added macOS. h/t: @coderuby

Niko
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semtex41
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  • Confirmed working on 57.0 64-bit, Linux Mint. – Vivian Nov 14 '17 at 23:03
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    Works on macOS 10.11.6 with Firefox 58.0b4. On macOS the userChrome.css can be found or created under: `~/Library/Application Support/Firefox/Profiles//chrome/userChrome.css` – coderuby Nov 16 '17 at 09:44
  • Note: if you open a new window, you'll still have to click the Tree Style Tab button if you open new tabs. Otherwise they'll be open, but hidden. – Anssssss Nov 16 '17 at 20:41
  • @Anssssss There is a plugin hotkey of F1 that toggles the sidebar. Details can be found in the description (at least as of ver 2.2.9 of Tree Style Tab) – semtex41 Nov 17 '17 at 06:48
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    Users who view issue this may also want to hide the Tree Style Tabs heading that appears in the sidebar: `#sidebar-header { display: none; }` – uglycoyote Dec 14 '17 at 17:19
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    just FYI. I did not have a chrome folder there neither userChrome.css file! Had to create it, but it works. – Vitas Jan 11 '18 at 20:27
  • I put it here: AppData\Roaming\Mozilla\Firefox\Profiles\d0blabla\chrome Note the "Roaming". There is also an up-to-date mozilla dir tree under "appData/local" but that did not work. – David Lotts Apr 18 '18 at 20:10
  • This is still needed and still works in 65.0a1 (2018-10-30) (64-bit). – daveloyall Nov 01 '18 at 18:06
  • This solution also works for Tab Center Redux. – Raptor007 Dec 25 '18 at 11:09