Don't like the new Firefox look regarding tabs and the url/toolbar? This css slims it down insanely:
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Go to about:config , look at "Root Directory" for the profile you wish to change.
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In that directory create a folder named "chrome". Place userChrome.css inside that.
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Go to about:config , change "toolkit.legacyUserProfileCustomizations.stylesheets" to True.
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Restart Firefox.
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Grab some coffee and enjoy using a cleaned up Firefox interface.
(Don't forget to customize the toolbar to remove empty spaces etc)