Firefox favicon / pinned tab size for all tabs by default on open. Add a userChrome.css file within a chrome directory in your profile and restart FF to launch.
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How to make ALL TABS identical in appearance to PINNED TABS via the UserChrome.css file? | Firefox Support Forum | Mozilla Support
Arty2/userstyles: Home-made UserStyle CSS files, to be used with Stylus or similar browser addons.
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How to make tab bar thinner (height) | Firefox Support Forum | Mozilla Support
i would like to increase the size of my address bar, tabs and toolbar | Firefox Support Forum | Mozilla Support
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