Looks to me like the % of infected almost reflects the % of market share.
IE ~ 80% of the market
and FF ~ 15%.
I'm a little off on the numbers, but it does seem to suggest that the browser you have doesn't change the odds of beeing infected.
This article is not accurate. Target will still be selling HD-DVD players.
http://gizmodo.com/gadgets/format-war/next-gen-slapfest-hd-dvd-responds-to-blu+rays-target-exclusivity-282967.php