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Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News
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I'm using vertical tabs since 4 years ago and to do so installed Tree Style Tab (https://tinyurl.com/y5gr4dyn)
Also has to disable horizontal tabs create or update the file
chrome/userChrome.css
located at your profile withand add the setting
toolkit.legacyUserProfileCustomizations.stylesheets
with valuetrue
(use about:config)@KarnaSubarna also found some interesting style snippets for Firefox 😀
https://github.com/mbnuqw/sidebery/wiki/Firefox-Styles-Snippets-(via-userChrome.css)