Great productivity add-on Rated 5 out of 5 stars

Very convenient add-on that allows browsing through hundreds of tabs while keeping everything structured and under control.Tabs' structure are maintained when Firefox is restarted.Many thanks to the developer!

A single issue lately; say I have tabs like this:

Tab A
Tab B
Tab C

if I open child tabs, every 2nd one will be displayed not next to the first child, but after an already existing tab:

Tab A
___Tab A1
Tab B
___Tab A2
Tab C
___Tab A3

instead of

Tab A
___Tab A1
___Tab A2
___Tab A3
Tab B
Tab C

Am I the only one getting this, what can I do against it? Thanks for helping!

This review is for a previous version of the add-on (0.14.2012111201.1-signed).