Finally! I have my old tree-style tabs back again after the Firefox upgrade debacle.

I was using "Tree Style Tab" and it worked really well, but I like to be able to recall my 100+ tabs from previous sessions. So started to use "Tab Session Manager". That just made everything go bad. The tab tree would be loaded in a complete and utter mess. Making it completely useless.

So, came across this add-on and never looked back. Can save a tab tree, go back to a previous session, export to a JSON file for munging in external scripts. Nice!

Happy to donate to the developer as its saving me bucket loads of time.

[Edit: To the developer - You're on to a winner here! Keep improving it, but remember why people wanted to use your add-on in the first place.]