I'm glad they are doing this because they need to do something about memory usage, but there are some problems with this approach. -websites change over time. If a site gets redesigned, it'll throw off test results unless they're rerunning the tests on old builds too -this still doesn't capture how users actually use browsers so could miss some serious leaks. What about clicking around on the same site, opening links from the same site in multiple tabs, leaving a tab open for a week, etc?

Additionally, they keep saying that extensions are a huge source of leaks. I feel their pain because they don't have that much control over them, but they need to come up with some sort of a solution to deal with it, because let's face it, who's going to run FFx without any extensions?