I know some others have already mentioned it, but this would be a great time to move your passwords to something more secure. I recommend Bitwarden as well. You can import you current passwords fairly easily.

I'd recommend getting off saving your passwords in the browser at all and move to something along the lines of BitWarden and install the appropriate plugins to your browser.

Saved passwords in browsers are often stored in plain text. I would highly recommend a password manager like BitWarden. Makes transferring them easy and it's more secure.

Container tabs are infinitely more useful than profiles, and easily one of the best features Firefox offers over other browsers

I don't use separate profiles (which I reckon are analogous to accounts) - but Firefox does have a feature called 'Container tabs' where you can isolate a sessions cookies into a container (default ones are labelled things like Shopping, Personal, Work, etc).

However, I think these are somewhat moot now as I think Firefox handles cookies differently in some way that went over my head - so I'm doing that thing where I post a semi incorrect answer to ensure someone shows up with the correct one.

i highly recommend the official mozilla addon called 'multi-account containers'. Each container has its own cache n what not. I found it very useful for when i had to use a site both as an admin and as a regular user and didn't want to clear my cache constantly.

bees knees: https://addons.mozilla.org/en-US/firefox/addon/multi-account-containers/

you can sync with a firefox account with firefox sync. im sure you could make a personal firefox account and work account to switch between