Yes, there were a number of leak bugs fixed between 4 and 5, and the Mozilla guys are chasing after tons more. They've created a project specifically to chase d

Yes, there were a number of leak bugs fixed between 4 and 5, and the Mozilla guys are chasing after tons more. They've created a project specifically to chase down leaks and bloat issues, and you can see the various tracking bugs there: https://wiki.mozilla.org/Performance/MemShrink https://wiki.mozilla.org/Performance/MemShrink More fixes will be in Firefox 6 and 7, it looks like. Here's a particularly fun bloat fix that should be headed for 7: http://blog.mozilla.com/nnethercote/2011/06/21/you-make-what-you-measure/ http://blog.mozilla.com/nnethercote/2011/06/21/you-make-what...