Very well put... I completely agree, I really enjoyed TO in the Panel. However, last night I upgraded to the Vivaldi Snapshot release and TO does not work anymore. It didn't seem like a TO specific problem as other Session/Tab Manager Extensions were behaving similarly.

The end result is that clicking on a group of tabs would only open a single tab instead of the all tabs in a group. Also, the window opened looked more like an app window - no tab bar, no extensions area... no right click menu.

TO needs some work to be able to fit into VIvaldi... I don't get the impression that TO is under "active development" anymore. That being said, there's no judgement towards the creator. This is a rather large undertaking for a single person to actively maintain. Then again, that's a good reason to rely on an open source community... But to each his own.

On a slightly unrelated note... There is a 3rd party Tree Tabs style extension[1] that seems to work fairly well. I just started looking at it today - Im not sure how it handles multiple windows yet... if at all.

[1]: https://forum.vivaldi.net/topic/15332/tree-tabs?page=1

I'd like to know if there's a work around for this as well. I know Vivaldi doesn't implement the entire Chrome API and hence authorizing works differently. I know other plugins have similar issues; like Google Keep, Calendar and pretty much anything Google-centric.

But, if at all possible - it would be awesome if there was a work around available. I'm hesitant of purchasing as I'm concerned some level of Google specific authentication will be needed in order to verify the purchase - obviously this would fail in Vivaldi