[aembleton]

1. Navigate to your profile folder [1].

2. cd chrome or create the directory if it isn't there

3. Inside chrome, open userChrome.css or create it if it isn't there

4. Paste the following:

  @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;
  }

5. Restart Firefox

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1. http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigatin...

[mmastrac]

I've been running the side-bar version of tab center with this userChrome.css fix but the best I can say about it is that it's "alright". The window close/max/min buttons are just not positioned very well on macOS.

Also, if you hide the sidebar header I think you run the risk of accidentally opening the bookmarks sidebar and being unable to get back to your tabs.