Thank you, Roy. Your add-on is the best in its category. I've tried two other, they loose. Yours is the easiest to use and it can split URLs into groups.

It's slick. I like the UI and especially the sets. However, sometimes I can't save sets. I set up the set, the extension tells me it is saved, I run the set and all the pages are opened correctly, but when I return the set is gone.

I can't see any pattern. Is there a maximum of the number of sets and/or the number of links in a set?

This addon is very helpful. Specially the sets feature. It would be better if you add a feature which would allow me to assign a custom keyboard to each sets.

almost perfect!
please add Lazy Loading: loading the next tab after user specified time OR even better: keeping 2 (configurable) loaded at all times and loading another one when the 1st is closed

Thank you!! it's very very good !!!

It's possible to automatically close popup of addon after i click on "Open group of links" ??

Fairly easy to add urls to a group, the settings popup disappears if you click outside of it making it tedious to copy/paste urls though. Ability to add multiple groups of urls is nice. One feature I'd like to see is keyboard shortcuts to open groups.

One of the addons I used to open multiple urls was not compatible after the new Firefox update (Firefox Quantum). Tried this one out and it's actually 100x better! No issues unlike the other reviewer having the sets disappear.

I have to check 10 websites daily to keep on top of things, so this makes my life so much easier. The other addon I tried before this one did not save the urls so I had to paste them in every day - tedious!