Thanks for your review. Last month I had little to no time to work on this project but I am back on it now.
Version 3 is currently in development and I expect it to ship with Firefox 63 later this month.
Tabs aside started as a small script that took all your opened tabs and created bookmarks for them and "grew" from that. Unfortunately the code became hard to maintain therefore I am doing a complete rewrite using Typescript. This new version will fix some of the bugs & bring new features.
Please consider checking out v3 and sorry for any inconvenience caused by this.
If you found a bug that is not listed on the github issue page please submit it.