this post was submitted on 11 Jun 2025
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Firefox

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submitted 6 days ago by [email protected] to c/[email protected]
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[–] [email protected] 6 points 6 days ago (1 children)

When was that? I only ask because Firefox has vertical tabs now.

[–] [email protected] 3 points 6 days ago (2 children)

Sorry for AI but I couldn't find it by just googling:

Yes, Firefox did have an in-house developed "Tab Center" — it was an experimental feature created by Mozilla as part of their Test Pilot programme around 2016–2017.

🧪 Mozilla's Original "Tab Center" Name: Tab Center

Status: Experimental Test Pilot feature (now discontinued)

Timeframe: Circa 2016–2017

Purpose: To explore the usability of vertical tabs on the left side of the browser, instead of the traditional horizontal layout.

🔍 Key Features Displayed open tabs vertically in a sidebar.

Showed a more spacious, scrollable list of tabs.

Included favicons and tab titles — easier to manage lots of tabs.

Supported mouse gestures like tab pinning and closing.

Looked and felt very similar to Edge’s modern vertical tabs.

[–] [email protected] 3 points 6 days ago

Ah TIL! I think it was finally added as of version 136, fairly recently.