1220366 - Hiding the tabbar with css (display: none) breaks the tab system.

Status: RESOLVED WONTFIX

(Firefox :: Theme, defect)

Description

[Robert Zenz]

User Agent: Mozilla/5.0 Gecko/20100101 Firefox/41.0
Build ID: 20150918100312

Steps to reproduce:

Let's assume we want to hide the tabbar permanently, for example with the following userChrome.css:

    @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
    
    #TabsToolbar {
        display: none !important;
    }



Actual results:

The tabbar is hidden as assumed, but the tab system is completely broken. After performing some operations (opening a new tab, switching tabs) all tabs become unselected and it is impossible to operate the tabs anymore (switching stops working, Ctrl+T does not open a new tab, instead toggles between selecting the url and the identity box and so on).


Expected results:

The tabs should keep working, even though the bar is not visible.

Comment 1

[:Gijs (out for now; he/him)]

We won't fix this; it's almost impossible because of how XBL bindings work. Use visibility: collapse; instead of display: none, or hide the tabs some other way.