Mozilla has confirmed that it will release the first update for Firefox 3.5 later this week to address a critical security vulnerability disclosed a couple of days ago that could lead to malicious code execution.
The update will most likely also address a bug related to slow startups due to large Windows temporary folders being scanned for Firefox’s randomness needs. However, some testers report the fix already available in a release candidate doesn’t improve the startup time, so it seems there are other possible causes and the fix may not help all users.
A second update (3.5.2) is already in the works and is expected for late July. This will address some bugs originally targeted for 3.5.1 that got postponed to speed Firefox 3.5.1 update.