http://pcworld.co.nz/pcworld/pcw.nsf/news/firefox-15-beta-tackles-memory-leaks
Firefox 15 beta tackles memory leaks, including those from add-ons
Mozilla has released a beta version of the next version of its Firefox browser with better memory management and significant speed improvements.
"Firefox 15 prevents most memory leaks caused by add-ons, including Firebug,"
"For many users with add-ons installed, this will significantly reduce Firefox's memory consumption, without requiring upgrades to those add-ons," he adds. "For those users, Firefox 15 is likely to be faster (sometimes drastically so) and less likely to crash, especially if they have multiple add-ons installed and/or keep Firefox running for a long time between restarts."
Nethercote explains that add-on memory leaks are caused by "zombie compartments," where information from web pages is stored and remains after you close a page or depart from it.
Firefox 15 cleans out those compartments, a move that its developers weren't entirely sure would work.
The "prime time" version of Firefox 15 is scheduled for avaiability August 28.
In addition to better memory management, Firefox 15 also supports the Opus audio format. The format, which can be played directly in Firefox 15, offers better compression formats like MP3, Ogg, or AAC; is good for both music and speech
