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Re:Firefox 57.0 Released by pixelbeat__ on Tuesday November 14, 2017 @11:47AM (#15696650)
I don't see how to disable yhe existing horizontal tab bar though? Now I have both that and tree style :/
Re:Firefox 57.0 Released by SAI_Peregrinus on Tuesday November 14, 2017 @01:51PM (#15697973)
You'll need a custom userChrome.css

    @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

    /* to hide the native tabs */
    #TabsToolbar {
        visibility: collapse;
    }
    
    /* to hide the sidebar header */
    #sidebar-header {
        visibility: collapse;
    }
You probably want to enable the menu bar if you do this, to stop the minimize/maximize/close buttons from overlapping the menu & other buttons on the right top corner.
Re:Firefox 57.0 Released by fasquoika on Tuesday November 14, 2017 @03:48PM (#15698956)
>keymaster/gatekeeper/there.is.only.xul

Pretty amusing tbh

Re:Firefox 57.0 Released by eumenides1 on Tuesday November 14, 2017 @01:57PM (#15698039)
There is no OOB way to do it ATM, you need to modify the userChrome.css. see below for more details.

https://www.reddit.com/r/firefox/comments/736cji/how_to_hide...