TreeStyleTab style multi level tab nesting

[theLucy]

Basically amazing idea for already amazing browser, allow grouping tabs into tree structure with multiple levels(as many as you want or some hard limit like 5) To be able to have messy workspace organized even better by collapsing tabs open for a good while

Here example of uncolapsed and collapsed tabs. Ignore tabs being stupid.

[DockterTeagle]

#891
but I agree