Half a million people are currently using the extension [1] though it's likely true that only a subset use it for multi-row tabs. [1] https://addons.mozilla.or

Half a million people are currently using the extension [1] though it's likely true that only a subset use it for multi-row tabs. [1] https://addons.mozilla.org/en-US/firefox/addon/tab-mix-plus/ https://addons.mozilla.org/en-US/firefox/addon/tab-mix-plus/