Rated 3 out of 5 stars

It's looking weird.
The firefox app button split-menu is different from the personal menu split-menu.
The blue highlight happens by the left AND by the right with a white spacing between them.
The blue arrow highlight is about three times narrower.
Are you going to fix it?

Plus, when I can rename an item, I can't turn it into a split-menu and when I can turn an item into a split-menu, I can't rename it.
I want to use show all bookmarks as split-menu, but can't rename show all bookmarks to bookmarks.
Are you going to fix it?

This review is for a previous version of the add-on (5.0.1-signed). 

The problem of split-menu is going to be fixed in the next version. The rename action is for sub-menus, and the "split-menu" action is for normal menu items.