Mozilla Foundation has worked to correct the 2 security vulnerabilities discovered in these days, and has release new versions of its products: Mozilla Suite (1.7.2), Mozilla Firefox (0.9.3) and Mozilla Thunderbird (0.7.3) are now available to download.
Only an alert... normally the Mozilla installations can easily overwrite the previous versions installed without problems, but I recommend to save all your plugins before upgrading (contacts and bookmarks are in a user default settings folder and you don't loose them).