(angela n.) (angela n.) If you use Firefox on a PC, you should make sure you update your browser right now: Mozilla says a Firefox user notified the company after spotting a bug that has the potential to search and download local files.

In a blog post yesterday, Mozilla said it released a security patch to fix the vulnerability, and is urging Firefox users on computers running Windows and Linux to update to Firefox 39.0.3 (you can do that by clickinghere).

The company says a Firefox user found an ad on a general news site in Russia that was serving the bug up, which would then search for sensitive files and upload them to a server that appears to be in Ukraine.

“The files it was looking for were surprisingly developer focused for an exploit launched on a general audience news site, though of course we don’t…

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