Create a new profile (not needed, but just to show that it happens in a clean profile). Goto http://www.forbes.com/2007/01/17/richest-women-entertainment-tech-media-cz_lg_richwomen07_0118womenstars_lander.html click "In Pictures: The 20 Richest Women In Entertainment". Click next through about 10 pictures. Close the browser and restart. Visit the same url and perform the same steps. I get constant harddisk churn. It ends if I pause long enough between clicking links. I bisected this to http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c402a67ba0db&tochange=6d0d4c0c8890 so bug 572223. If I disable cookies in the options then the problem goes away. I tried vacuuming the cookies.sqlite file, it didn't help.

Try the fix for bug 595925 (or wait for post-b7).

Dupee has final+.

(In reply to comment #1) > Try the fix for bug 595925 (or wait for post-b7). I'll note that we are still doing the I/O, it's just that it's no longer on the main thread.

Bug 595925 seems to reduce the noise coming from my harddrive to what is was before bug 572223.