[Update: just noticed that Simple Tab Groups (STG) was updated today - to v2.4.8. This is according to FF\Recent Updates, which also states "Sorry, but there was an error loading the release notes". Might any of these factors be something to do with my total loss of all tabs and groups!?!? Seems I'm having Certificate issues in FF now also. Concidence? Mmh]

OK. In principle this add-on is exactly what's required: and easy way to switch between groups of tabs.

By this I mean it should be like a "bookmarking plus" process, whereby a group of tabs is opened, new tabs become part of that group, and all tabs are auto-saved immediately as such. In this way, the tab "Group" is kind of similar in concept to a bookmark "Folder" except the latter is wholly maintained manually (time consuming, error prone, but safe!).

Managing tabs in groups (Moving etc.) is then required, as is naming the groups. This is achieved for the most part (but could be a bit more streamlined re the deepening menus!?).

This system is good, and users - including me - are becoming highly reliant on this add-on for everyday use. Great!

But when a user looses 100's of tabs that were in numerous groups (yep - like me!), it means there's something fundamentally wrong with the design.

I am aware of the Firefox bugs mentioned in various places, but this add-on needs a solid, fully-tested means of automatically backing up groups of tabs. In my case, Win10 glitched and put apps in a semi-disabled state, so MS have caused this, but still...

Having no obvious means to recover tabs is a REAL pain. I do have a manual backup of 2-3 weeks ago, but that's way out of date even after 1 hour of serious browsing, working, researching etc. etc.).

IMO, I don't see the need for 'live' or always open tabs when switching groups. Keep it simple I say. I group tabs (or did before it all went awol) by 'project' and by 'work mode' (e.g. "MX5 rebuild" and "Web Training"
etc.)

So my advice is to set a clear requirement spec and stick to it! Get it working and really reliable (users will help!!). Then... see what users want. A lot of good work has gone into this Addon and it's potentially brilliant, but it's popularity will turn to hatred with no crash recovery options. Crashes happen (MS!) and are OK actually (what!?!) as long as they're not too often (a sad state of current day software running under Windows, but that's modern life for ya!).

I hope the developer can assist me (and others!) and I can recover my groups, but otherwise I can't afford another "total loss" and will have to ditch this add-on :(

Best wishes peeps //L