It doesn't matter what OS you're running.
Get Firefox. Get adblockplus
. Get noscript
. Make sure it's blocking flash/pdf/java (it should by default). Whitelist specific known-good sites if you want, but do so at your peril particularly if they host 3rd party ads.
Or, even better, have a separate vmware / xen image for generic stuff -- web browsing, running questionable apps...
“The egg hatched...” “...the egg hatched... and a hundred baby spiders came out...” (blade runner)
“Who are you?” “A friend. I'm here to prevent you from making a mistake.” “You have no idea what I'm doing here, friend.” “In specific terms, no, but I swore an oath to protect the world...” (continuum)
“It's a goal you won't understand until later. Your job is to make sure he doesn't achieve the goal.” (bsg)