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Mozilla released a Firefox Nightly test build with vertical tabs - gHacks Tech News
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Especially with the gigantic tab buttons the browser uses by default even in "compact" mode.
To think that I have lived years without knowing about those little features like combining title and menu bar to save space
Yeah, but combining those doesn't make the buttons smaller and tab-like. Enabling userchrome.css support and tweaking it yourself does, though. Still dumb that Firefox uses giant buttons instead of tabs.