topic Re: A blank area on the left of the tab in Discussions

A blank area on the left of the tab

Xelliphine — Tue, 16 Jun 2026 04:38:53 GMT

It's weird that there have a blank area on the left of the tab and it can't be closed or disabled, but it will disappear when the window is maximized.

This doesn't look consistent, so I hope it can be delete.

Re: A blank area on the left of the tab

Xelliphine — Tue, 16 Jun 2026 04:53:15 GMT

Actually, I mean not delete this blank area completely, I wish it could be smaller than it is now.

Re: A blank area on the left of the tab

Agentvirtuel — Tue, 16 Jun 2026 05:45:16 GMT

Hello

You can try
With the help of userChrome.css, you can find tutorials on the web

.titlebar-spacer[type="pre-tabs"]{display:none!important;}

Source, with the help of Browser Toolbox
https://firefox-source-docs.mozilla.org/devtools-user/browser_toolbox/index.html

Re: A blank area on the left of the tab

siffemcon — Wed, 17 Jun 2026 02:07:08 GMT

Try

.titlebar-spacer[type="pre-tabs"]{width: 10px !important;}

in userChrome.css.

https://www.userchrome.org/how-create-userchrome-css.html

Re: A blank area on the left of the tab

Agentvirtuel — Wed, 17 Jun 2026 04:14:26 GMT

Hello

To complement, if you wish to view, with the help of Style Editor
https://firefox-source-docs.mozilla.org/devtools-user/style_editor/index.html

Preview, userChrome.css
https://www.youtube.com/watch?v=4ujk-isbzF4

Re: A blank area on the left of the tab

Agentvirtuel — Wed, 17 Jun 2026 05:11:15 GMT

Other illustration, userChrome.css

For information, a space for users css https://www.reddit.com/r/FirefoxCSS