Mozilla users warned--upgrade now (http://news.zdnet.com/2100-9588_22-6062713.html?tag=nl.e589)
Looks like everyone is getting hit.
Olds
Firefox informed me of the new upgrade when it came out. I thought Thunderbird, their email program, would do the same. Thunderbird doesn't (didn't)notify you when an upgrade is available, nor did it have a menu choice to check for upgrades. I had to go to the Mozilla site, see what the current version is (1.5) then check my version number (1.0.7) and do a manual download. Fortunately, the new version will automatically check for new versions.