I have been spending more time recently working on automated top site testing using the Sisyphus framework to spider the top 1.000.000 sites according to Alexa. This helps me find pages which cause Firefox to crash, leak or assert.
Using Jesse Ruderman’s Lithium test case reduction tool, I can create reduced test cases and file bugs for each of the crashes, leaks and assertions I find.
I like doing the top site testing because it helps make Firefox an even better browser than it is already.
You can read more about top site testing here.