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Multirow tabs

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Hi. I am trying to bring back mi lovely multirow tabs. I've found some information on the web about CSS and file userChrome.css and maybe I could win this war, but Firefox is still beating me all the way :) 1. What I need: I need tabs in multiple rows (3 or 4). If tabs quantity is more than can fit in this rows I want an arrow buttons to scroll this list up and down. All other tabs should be out-of-bound of the tabs container. 2. What I've done:

I maid some changes in userChrome.css like this:
  1. tabbrowser-tabs .tabbrowser-arrowscrollbox {
 display: -webkit-flex !important;  


  1. tabbrowser-tabs .arrowscrollbox-scrollbox {
 display: -webkit-flex !important;
 /*flex-wrap: wrap !important; was not needed, -webkit-flex wrapped tabs*/
 width: 1200px !important;
 box-sizing: content-box;


3. What I've got: When I maid my humanity-less experiments in Browser inspector, everything was not so bad. I almost did what I want (see attached screenshot.8.png). I had a limited by 3 rows tab bar. Scroll buttons didn't react on single mouse click but double click scrolled something and somewhere (even with grayed left scroll button). But after Firefox restart I always getting the same: tabs panel looks strange, scroll buttons are absent (see screenshot.9.png). Nothing helps at all but only after comment-and-then-immediately-uncomment "display" property in "#tabbrowser-tabs .arrowscrollbox-scrollbox " section in userChrome.css using Browser inspector I get back to screenshot.8.png.

4. What I ask you: HEEELP! I've never did anything in web, html5 and CSS (learning it for the last 4 days). And I really can't understand different Firefox behavior after restart and then after "reDisplay". It seems like a bug. Help me not to break my keyboard :)

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Todas as respostas (2)

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Oh, sorry!!! Firefox Quantum 62.0.3 (64-bit) Processor (if needed): AMD Ryzen 5 Huge amount of RAM.

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