I think 7 is the first version with a useful "about:memory" page so that you can get some idea of what's actually chewing up your RAM. Now that you've clicked

I think 7 is the first version with a useful "about:memory" page so that you can get some idea of what's actually chewing up your RAM. Now that you've clicked "yes", if you install the "about:telemetry" addon you can go to about:telemetry to see the exact data that Firefox sends: https://addons.mozilla.org/en-US/firefox/addon/abouttelemetry/ https://addons.mozilla.org/en-US/firefox/addon/abouttelemetr...