The Problem with Firefox is that there are a vary of plugins from other developers, but it could not be that users have to live with growing memory usage or memory leaks by these addons. This gives also Firefox itself a bad impression and I think there should be a solution to stop the trend because as a user I can not always identify what's the problem now and why the firefox-process gives no memory free but it makes firefox partially unusable if I have to open more than a few tabs. In my opinion also popular extensions that are used by a lot of people still have memory leaks or even the addon-developer does not know that his addon has one. Is there no possibility that firefox helps, that addons can't produce so many memory leaks or otherwise Mark them in the Addon repository if they have leaks or memory problems?!