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How to Downgrade Firefox version. 1. Open your Firefox browser or any other browser on your computer. 2. Click on this link to see older versions: 3. Chose any of the older versions. 4. Download and install version on your computer. Downgrading to an older version can cause loss of Firefox user data, as well as performance and security issues.Is Firefox Portable safe?
When a flash drive is plugged in, it is a part of that PC. Viruses can then go either way. And that's the way it is on every portable platform. That said, Firefox in and of itself is much more secure than Internet Explorer. So, as long as you're using the latest version, then it won't be auto-installing spyware or malware.