Comment by sigtstp

Interesting! Some overlap with these Firefox add-ons:

- Tree Style Tabs: https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta... (more simplistic, no session saving functionality)

- Tree Tabs: https://addons.mozilla.org/en-US/firefox/addon/tree-tabs (more complex, can also save sessions, but incompatible with some other add-ons and not evaluated for security by Mozilla)

Neither rearrange tabs in the window, just offer an alternate tree listing of open tabs.