Reverted to v2. V3 didn't work out so well..

Fixed Tree Style Tab bug.

https://gitlab.com/losnappas/Open-Existing/commit/84d19e51d2df604ac90fdd7ba88bec6738385148

Changed strategy for duped tab detection.
+ Dropped webrequests permission.
+ should be more consistent.
Fixed tree style tab bugs.

https://gitlab.com/losnappas/Open-Existing/commit/39026b1ae7c21b4e3d14074382dc98c1a455cc47

- Added TreeStyleTab support
- Fixed homepage
* moving my stuff to gitlab...

Still plenty of shortcomings:
- redirect urls mess this up
- can't turn off
* would be an easy fix.. someone wanna do it? just add a browser action button

well I hope to patch this again next year! teehee~~