Here are the specific fixes for Firefox… rather small:
- Fix for a potential buffer overflow vulnerability when loading a hostname with all soft-hyphens
- Fix to prevent URLs passed from external programs from being parsed by the shell (Linux only)
- Fix to prevent a crash when loading a Proxy Auto-Config (PAC) script that uses an “eval” statement
- Fix to restore InstallTrigger.getVersion() for Extension authors
- Other stability and security fixes
It’s highly recommended to upgrade, and you may already be up to date if you are using a version not handled by your OS. You can read the notes and information here.