How to hide the close tab button when only one tab is opened?

[Aleksandra0056]

My problem:

• Hello Mr. black7375, I want to ask if you know how can I set auto-hide the "x" close tab button when only one tab is opened in Firefox.
• Also, how to set it to not count the Firefox View tab (button) as the second opened tab?

Screenshots:

This is not a problem on Vivaldi, because there is already hidden the close tab button:

Nor in Opera browser:

[Asad-13]

I believe the first is possible via userChrome CSS. I remember seeing that effect in other CSS themes. I'll try and search it up, but will need a few days as I'm not that well versed in CSS.

Although for the firefox view getting counted as a second tab, I believe that is inherently a property of firefox. Might be wrong, idk

[Aleksandra0056]

I already found a desired feature in the CSS plug-in called "CustomCSSforFx" (which was formerly part of Classic Theme Restorer) a long time ago, so I'm finally closing this discussion. (I don't even know why I kept this open).

By the way thanks all for help!

Closing as outdated.