This is why it’s always good to wait a bit before downloading new versions of browsers. In a post on Mozilla’s official security blog, the organization says it has discovered a “serious security flaw” in the latest version of its Firefox browser and has stopped offering it to users so that it can be fixed. The company has already released a patch for the Android version of Firefox 16 and has created a webpage that will help Firefox users temporarily downgrade their browser to the previous version. Mozilla says that the Firefox 16 security flaw
“could allow a malicious site to potentially determine which websites
users have visited and have access to the URL or URL parameters.”