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
Combined with container bookmarks extension, it becomes really handy.
Amazon, i can login as my personal or my company account based on the bookmark I click
Social media, different profiles straight in with their bookmark
I manage a few things for my mother, utilities and such, keeping her logins already logged in in a bookmark folder is handy.
Essentially, any time you need to segregate logins / accounts.
Multiple logins to some sites, be that for a personal and a business instagram for example. SAme for shopping sites, Amazon with my company login and one with my personal. Container bookmarks makes this nice and simple to manage and get directly to where you want to be, as who you want to be.
https://addons.mozilla.org/en-GB/firefox/addon/container-bookmarks/
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.