I'm running Ubuntu on an HP laptop, so it definitely works, but you'll need to monkey with the Flash a bit.
Firefox won't work at all, but Chromium does (open source version of Chrome).
For gameplay, I use Chromium, but had to "steal" the Flash from Chrome. You should be able to find detailed instructions on the interweb for this...or there might also be some in the forums here somewhere.
My advice would be to buy it, as long as you have a reasonable knowledge of computers, and the ability to follow directions....since you'll probably have to figure out a lot of things on your own. The good side of that is that there's plenty of resources available online. Send me a friend invite, and I'll gladly point you in the right direction. :-)