Open multiple bookmarks at once in Firefox

Let me describe what I would like to do. When I open the bookmarks menu in Firefox I can load one bookmark at a time that is in a folder. I know that I can load all bookmarks in a folder by middle-clicking on the folder directly which loads all the bookmarks and removes every other open tab in the process.

This is not what I’m looking for. I would like to be able to pick multiple bookmarks at once and load them all in new tabs once I’m finished. Much like the left-click CTRL option in Windows Explorer when selecting files.

I tried to find a solution but no Firefox add-on or option seems to offer it. I know that I have got some Firefox geeks among my readers which is why I’m asking this question here.