They removed browser.tabs.closeButtons. It's now impossible to hide the close bu...

id · on July 22, 2014

The reasoning behind that explained by Mozilla employee Jared Wein:

https://bugzilla.mozilla.org/show_bug.cgi?id=865826

Istof · on July 22, 2014

"These would be better supported and more discoverable if they were implemented by an add-on."

Better support but not by Firefox and more discoverable, but not in Firefox...

ahoge · on July 22, 2014

Aw, crap. Do you know the CSS offhand?

I already have to use some user CSS because they removed the ability to set the tab min width via `browser.tabs.tabMinWidth`, because that property wasn't "worth it" according to one developer.

Edit: Turns out Classic Theme Restorer has an option for that.

Dylan16807 · on July 22, 2014

>tab min width

That is a nightmare to set now if you want tabs to go below about 40 pixels, thanks to the Australis swoops. It used to be one line of CSS to set min width to 0-ish, now I have a giant blob of custom CSS on top of Classic Theme Restorer.

ahoge · on July 23, 2014

Yea, same here. :/

id · on July 22, 2014

This CSS should do the trick:

  .tab-close-button { visibility: collapse !important; }

Or addons.

fletchowns · on July 22, 2014

The bugzilla ticket in question if anybody is curious: https://bugzilla.mozilla.org/show_bug.cgi?id=865826