Rated 5 out of 5 stars

I have recommand the extention for my friends and now I have know thatto change groups with CTRL+~, but I don't want to use keyboard , is there a button to change the groups?
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and it can't treat https://developer.mozilla.org/ "https"

This review is for a previous version of the add-on (0.3.1.1-signed).  This user has a previous review of this add-on.

Yes, there's "Tab Groups" toolbar button for that. It should be on the right edge of tab strip. If it's not there, you can add it manually using toolbar Customize dialog (to call it, right-click on empty space on tab strip and choose "Customize..." from the menu).

As for developer.mozilla.org via "https": I cannot reproduce that.
There can be a problem if site loading is slow: tab group will be changed only when page is fully loaded.