I just noticed here lately that whenever I go to a site that has a lot of Flash content, my Macbook's fans go full speed. I have the latest version of Flash installed. It happens using either Firefox 3 or Safari. Anyone else experiencing this?
Adobe has notoriously not optimized Flash for OS X, so flash sites will take a lot more horsepower than they need. More CPU usage means more heat means more fans. The only solution is to write a note of displeasure to Adobe or stop visiting flash sites, because the problem is entirely Adobe's fault afaik.
This has happened to me over and over again on my Powerbook as well. Nothing to worry about it's just crappy Adobe product not optimized for Mac as was stated.
I also have major issues with Java on my powerbook. probably 80% of the time Java will lock both Safari and FF3.0 or 2.0.