I really like the extension and the "grouping" capabilities. However, I don't think the grouping capability is working really well for me. I will set up groups and then the groups will suddenly all disappear at some point, all the rules will still be there but the groups just disappear and all the rules will fall under "Ungrouped". Am I missing an important step?

It would be nice to be able to be able to sort the rules through drag and drop or arrow keys.

Using Firefox Developer Edition v59

---------EDIT ---03/11/2018---
I realized how to replicate the issue. After you have setup the groups, when you "Clear All History" of Firefox (I select only Cache, Cookies), the grouping gets reset.
---------EDIT ---03/11/2018---

Thanks,