I've created a userstyle which will create a minimal version of the new usersymbols
Make sure you have Stylish for Firefox
installed as a browser extension (apparently it works in Opera too!
Then, install Minimal symbols from here
by clicking the "Install with Stylish" button!
Hoorah! You now either have a tidy minimal layout. If you are here to install the "Classic" version which used to exist here - you are out of luck, sorry. While probably a bit late, I've deleted it as I don't feel there's any point trying to avoid change. Embrace it instead and improve it if you can!