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My new version of Firefox is 10x more vulnerable to malicious URLs and trojans as my fire wall and inernet security software is not compatible; need older ver.

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Have Kapersky Internet Security 2013. Everything was working well until I upgraded Firefox. Tired of doing all the additional scans to find malware. Please tell me how to download and install an earlier version of firefox like 20 or 21.

Have Kapersky Internet Security 2013. Everything was working well until I upgraded Firefox. Tired of doing all the additional scans to find malware. Please tell me how to download and install an earlier version of firefox like 20 or 21.

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The Kapersky ad-ons don't actually protect you from anything malicious. Your anti-virus and firewall are still protecting you in the background.

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A moderator on Kaspersky's forum has explained that the core product provides the real protection and the browser add-ons just add convenience and visibility: KIS 2012 add-ons and Firefox 14 - Kaspersky Lab Forum:

The bottom line is this:
-URL Advisor adds nothing to your protection. Bad websites will be blocked regardless of plugin, "green" sites aren't necessarily clean either (design limitation of such feature)
-Anti-banner plugin only provides an easier way of adding banners to KIS blacklist via right click in FF. Banners will be blocked regardless of plugin
-Virtual keyboard is useful only when your system is infected. Since the main protection features are working regardless of plugins, there's little chance of you actually getting infected and needing VK.