- doesnt work on the last stable version of Firefox, ver. 56
- in ver 57 there is a number of differences with regular behaviour:
cant make the tree style tab smaller than some limit, which is too large for me
top line tabs are not removed (what is then the point of having this extension?)
Hope the extension owner and the firefox team will fix bugs fast. without this extension there is much less reasons not to go for Chrome

Used with Firefox Dev build: I really enjoy this add-on. I love the premise. Stability seems iffy: (1) I sometimes observe the parent tab separated from its children, i.e. there will be tabs in between the parent and the child at inconsistent depths; (2) I have observed once in the first few hours of using it the whole sidebar becoming blank and unusable, requiring a restart. I also have one suggestion: I find that this add-on simply supersedes the vanilla browser tab strip, so it would be nice to have an option to hide the default horizontal tab strip.

Tried every setting I could to prevent child tabs from every being closed, but I was still losing tabs when closing *some* parents. Tried promotion, dummy, only when tst is open, etc.

Когда уже выйдет версия под последнюю лису? Я годами использовал аддон и без него сейчас как без рук. Поставлю 5, когда обновите.

Either crashes or intentional closures.

Awesome otherwise.

Working in 58, but after I restart, all nesting is gone...