You shouldn't use your alt accounts except here on meta, or your alt accounts could get banned as well.
The ban on your main account could also be extended for ban evasion.
I am using it from a different browser. Won't that be okay?
Still ban evasion but you can try get away with it if you wish, but I'd just wait your short ban out instead of running the risk of further bans on all your accounts.
What he said. If you get banned, you're banned for a reason. Making a new account for ban evasion, or any other method intended to evade your ban should be bannable though. When you're using a different browser or IP address, we may not know it's you, but you're still breaking the rules, and you should be banned again upon discovery