Once upon a time the tabs list of Opera browser could be configured to the left side of the window, instead of on top.

Apparently this has been removed. **Am I right?**

**Is there any web browser still allowing a vertical list of tabs?**

> 
> What OS should it run on? What other features are important for you (e.g. personalization, addon support)? Speaking of addons: have you checked if it can be achieved via one of those? Like e.g. Vertical Tabs Reloaded does for Firefox? – Izzy♦
> 
> 
> 

To be run in macOS. I'm open to Chromium plugins, but not to Firefox plugins.

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**Post accept note**: if you know a way using Safari, I'm reading.