As i say, it really comes into its own with the container bookmarks addon
https://addons.mozilla.org/en-US/firefox/addon/container-bookmarks/
It can be a bit of pain to get setup with containers for bookmarking, but if you get stuck feel free to shout
Yeah, i have a combination of a selection of folders in bookmark bar for various functions and a home page / speed dial again with bookmarks which are container enabled, makes my workflow much easier.