The problem is discoverability and UX. I believe, in chrome profile management is another menu option. In FF you have to use about:profiles or start Firefox with a specific command line argument.
Unless you know about it or are actively looking for the feature, there's no way to know. If you are coming from Chrome, this unfortunately leaves the impression that Firefox doesn't support profiles (a must have feature for some).
It doesn't even hint or show up in settings search. It is as if they don't want anyone to use/know about profiles.
Unless there's a way to create containers that also disable extensions in their context I will always need multiple profiles.
edit: never mind, I wasn't awake, see reply.
FWIW on Windows this works fine for me. I run two different profiles. I get two separate taskbar icon groupings, they stay together and collapses independently.
Must admit I've not used multiple profiles on my KDE install yet.
It's been far too long since I set it up, so I forget if I had to duplicate the application, if you do mine uses these settings:
Firefox Profile Manager
firefox
--new-instance --ProfileManager
I prefer to NOT group windows so I can sort them manually, but also, offhand, because I believe it groups off of the executable name, not the profile.If you right click on the Icons-and-Text Task Manager Settings, the Behavior tab has TWO options for Group: behaviors [Do Not Group] (I prefer this anyway) or [By Program Name] which I take to mean the executable. I'm not sure if it follows symlinks, but if that's an issue you can probably make a script to hardlink instead. A couple firefox-profilename applications that point back to firefox should work. You can even make a custom version of the launcher that invokes with a specific profile ID rather than selecting one.
As a further set of asides:
Firefox please 1) It'd be nice if firefox renamed it's arguments list to prefix it with the selected profile ID as the first item.
KDE Plasma please 2) It would be great if the grouping thing could be expanded to E.G. consume the program name + first two tokens of the arguments. Maybe with a customization per group.
KDE mega _please_ 2.b) Or even just to call an external program with a window ID handle and have it write back a string that's used as the group 'name'.
Will have to test using multiple profiles using the same executable.
However, if the same "trick" works on Linux, perhaps it could be exploited by Firefox creating a separate executable that launches a specific profile.
We do that with our application, using the "self-extracting zip trick", ie appending data to the executable that is read during start-up.
Though it'd still be many times better if Firefox made it easier to tell which profile was associated with a given process (prefix the argument list as if launched with that). ALSO if KDE's task list supported improved flexibility for group categorization. It wouldn't even need to run an external program other than once for each new window created.
It met all my needs for multiple profiles. I use it to have multiple concurrent sessions for different sites (eg: one AWS account/role per container).
[1] https://addons.mozilla.org/en-US/firefox/addon/multi-account...
Where I work we are required to have 2-3 Microsoft accounts for security separation. Account containers makes it possible to interact with virtually unlimited profiles all in the same browser window. No need for in-private browsing or multiple widows of chrome or edge, it just works. When you have it configured just right it's a thing of beauty.
Don’t know of a keyboard hotkey during launch for this, I keep a separate desktop shortcut to run w/ the profile manager. You can also make shortcuts to run with a specific profile.
https://wiki.mozilla.org/Firefox/CommandLineOptions#-Profile...
https://connect.mozilla.org/t5/discussions/here-s-what-we-re...