That's hard to answer because the only known demonstration of how to exploit the vulnerability was specific to Windows. Info about it: https://www.mozilla.org/security/advisories/mfsa2016-92/ In the meantime, a patched version was released yesterday. You could try the internal updater: [[Update Firefox to the latest version]] If the updater doesn't work for you, you can download a full installer (scroll down to your preferred language): * Firefox 50.0.2: https://www.mozilla.org/firefox/all/ * Firefox 45.5.1esr: https://www.mozilla.org/firefox/organizations/all/ '''However, if you are installed/update Firefox through your Linux package manager rather than directly, you may have to wait a bit for it to come through.'''