Too many entries in list will tabs outliner lead to crash.

You can try open options by right clicking on the extension icon. And then from there backup current tree to GoogleDrive or just export to file and then open it in Backup view. If this succeeded you can safely uninstall Tabs Outliner and install it's again, this will reset the tree. Then you will be able to start new tree and use your exported tree as archive (it's not editable, but hierarchies from BackupView can be drag and dropped back to the main tree).

This worked.
Thanx a lot.

Before I contacted you, I feared to do so, because I didn't want to lose my Paid Mode or that the status will just be restored.

Now, after I contacted you, I felt save to risk it.
Thx again.

Thru reinstalling I lost my paid mode, got it back und lost it again.
What can i Do?

And now I lost it forever?

I too am having problems with Tabs Outliner crashing due to memory issues. It happens about once every other day. I do typically have a large number of tabs open which is one of the driving reasons I use the extension. It would be keen if there was an automated way to clean things up as this thread suggests OR either some form of memory optimization (assuming this isn't just a leak) or a way to increase the limits Chrome allows an extension before it will crash the extension for using too much (I have plenty of RAM in general).