Outstanding, but NOT for saving bookmarks.

Use the bookmarks bar and a bookmark manager to save your bookmarks. This wonderful app serves a different purpose, and that is to open the four/six/twenty bookmarks that you use for a specific environment/mission.

Dev research: Pull out these six tabs to search.
Tech Support: Load all your tabs related to proving phone support.
Movies: Pull out IMDB and places to buy tickets.
Food: Pull out your twenty favorite restaurants that deliver.

I recommend you go to the options, and choose to disallow duplicates, and to not remove from the tabs by default.

I wish we could edit the names of the saved tabs, since some things look like duplicates but are not.

One of the best add-ons ever.