this post was submitted on 11 Jun 2025
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Sorry for AI but I couldn't find it by just googling:
Yes, Firefox did have an in-house developed "Tab Center" โ it was an experimental feature created by Mozilla as part of their Test Pilot programme around 2016โ2017.
๐งช Mozilla's Original "Tab Center" Name: Tab Center
Status: Experimental Test Pilot feature (now discontinued)
Timeframe: Circa 2016โ2017
Purpose: To explore the usability of vertical tabs on the left side of the browser, instead of the traditional horizontal layout.
๐ Key Features Displayed open tabs vertically in a sidebar.
Showed a more spacious, scrollable list of tabs.
Included favicons and tab titles โ easier to manage lots of tabs.
Supported mouse gestures like tab pinning and closing.
Looked and felt very similar to Edgeโs modern vertical tabs.
https://duckduckgo.com/?q=Mozilla+test+pilot+tab+center
Ah TIL! I think it was finally added as of version 136, fairly recently.