The latest version of Mozilla Firefox includes an improved defense against malware downloaded through the browser, which could prevent many kinds of infections. The new defense comes in the form of improved malware detection in the browser. When a user downloads a file from the Internet, Firefox looks at the URL and compares it against a list of known malicious URLs from the Google Safe Browsing API. Mozilla is planning to improve on this method even further in the next version of Firefox, which is due in September. Along with the improved malware protection, the new version also includes patches for 11 security vulnerabilities.
Source: https://threatpost.com/mozilla-improves-malware-blocking-in-firefox-31/107405/