Fixes to memory footprint land in Firefox 7
Firefox 5 was all about bug stomping and the stillborn channel switcher, Firefox 6 will see the addition of lots of HTML5 and CSS3 features and more privacy controls, and Firefox 7 — at long last — will focus on memory management and performance increases.
Firefox 6, which moves to the Beta release channel today, introduced a significantly improved about:memory page with buttons that can manually trigger garbage collection (GC) and cycle collection (CC). Garbage collection frees up memory by clearing old and unused JavaScript objects; cycle collection does the same for DOM objects, including web pages. By hitting these buttons repeatedly — or by hitting “Minimize memory usage”, which triggers both processes three times in a row — you can reduce Firefox 6′s memory footprint significantly.
In Firefox 7, however, which will feature-freeze and percolate down to the Aurora channel today, there are two big changes that should reduce the memory footprint of Firefox for all users:
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