‘Inside Firefox’ addressed complaints about the Firefox 1.5 memory leak today saying that in reality, it is “a feature.”
The post goes on to explain the feature thusly:
“To improve performance when navigating (studies show that 39% of all page navigations are renavigations to pages visited < 10 pages ago, usually using the back button), Firefox 1.5 implements a Back-Forward cache that retains the rendered document for the last few session history entries. This can be a lot of data. It's a trade-off. What you get out of it is faster performance as you navigate the web."
So there you have it.
For more information about how the leak works – check out Inside Firefox.
Posted by Sean