It will also helps many other extensions.

By the way. For users who use this with one big window scenario there is one secret feature - if this big window will be opened with Alt-DblClick it will reopen only the tabs which was open on last save, without the all the other saved tabs.

Also, if it is happens that you a programmer, to properly reassociate the new window created by "Continue Where I left Off" Chrome option with an old one saved in the last closed session, need solve this, really very easy and quick to implement issue in Chrome:

https://code.google.com/p/chromium/issues/detail?id=176030&can=5&colspec=ID%20Pri%20M%20Iteration%20ReleaseBlock%20Cr%20Status%20Owner%20Summary%20OS%20Modified

First, I long ago do not expect my users do donate anything because they don't.

Second, do you use "Continue where i left off" option in Chrome?

Looks like this. It is why you obtain on restart a brand new window. It is created by Chrome, not by TO.

This extension meantime is not very compatible with this option.

Meantime the only advise i can give is to disable the "Continue where i left off" option (the same advise the author of Sidewise is given by the way) and open this your one big commented window from the TO.

... And the threatening in the end of your request was really superfluous. 

Mentioning the url might help by the way, as i think it is more likely to occur with some specific sites who's actively utilize redirects.

Ok, thanks, so need done some more work... Have some guesses what might help, but....

I hope that this is not a super critical, as I need take a small pause from maintenance releases, for 2-3 weeks maybe, and concentrate on new features.

Yet the exact scenario which always reproduce the problem of course will help to solve this problem immediately.

I done some changes. Please notify me if you again encounter this phantom tabs. It might help, or might not. Have in mind some more approaches. But actually changes that i done might solve this issue already. 

As about strange phantoms in memory details screen - this is 100% not related to Tabs Outliner. Maybe some Chrome internal problems or some other extension.

Chrome really does not allow sidebars. 

And drop-down window was considered, tried and unfortunately it has own issues.

This configuration as now really has many advantages, try it for some time. 

I am sure you will like it, i was a former TreeStyleTabs user, used it for many years.

The TabsOutliner approach with new window despite unfamiliar and new actually much more usable. People even start to copy it this way to Firefox - as separate a window.