I agree with Contradiction, the devs claim Mozilla to be the best browser to play Tanki on, but it works suprisingly well with Google Chrome and Maxthon Nitro. Though, if FPS is your only aim, go for Standalone Flash Player -
Using Standalone Flash Player
You have to be inactive from the account with which you plan to get the "gifts" for at least one month. They can vary according to rank, but you'll most likely get a Score Multiplier Pass, some supplies and crystals.
Customer support service by UserEcho