Having multiple gmail accounts in the same brower

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ok, i searched google for a good hour or two. my problem is this: up until today, i was able to have one link to go to my college email (hosted by gmail) and have another link for my private email address. obviously today that no longer works. it's rather annoying because, even though i have multiple login ENABLED for all accts, i still need to log into each one on its own, every damn time i use the internet. i have it allowed to leave cookies, and this still works. I SEARCHED GOOGLE AND ALL THAT I CAME UP WITH WAS THINGS FOR USING THE SAME LINK, NOT DIFFERENT, EVEN THOUGH I QUERIED ABOUT HAVING PRIVATE AND BUSINESS AT THE SAME TIME wtf can i do?

 

sorry, i meant college yet typed business. i cant have my laptop w me during class, so how could i check it then? lol

in other news, i managed to work it out for now, so when im in between classes, i can have one link to my college email and another to my personal

 

use firefox then install addon it names was "multifox" dont ask link u can google it LoL
i always use it for playing online browser game