The Mozilla Firefox
have already started spreading the latest Firefox
version with the version number of 3.5.3 to the official mirror servers. This usually means that the next Firefox update is imminent which would go along well with the official schedule which suggests a release tomorrow.
The beta release notes which are currently publicly available mention several security and stability fixes making the update a recommended update for every Firefox user currently working with the 3.5x branch. The bug list lists 43 bugs that have been fixed in this version of Firefox with nine bugs being rated as critical.