I am using Iceweasel, the plugin installed just fine and loads my profile. Though after the advertisement nothing gets drawn on the screen. I just start hearing the game sound and no images at all.
I am using the latest AMD Catalyst drivers, my GPU is a Mobility Radeon HD 3450 and my CPU is an Athlon64 x2 QL-64. I am running Debian 7.1 64bit.