Here you go:
Additional browser plugins
WOT (Free) -
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To help you avoid malicious sites you can use Web of Trust (WOT) a website rating browser plugin. After you add it to your browser make sure you only visit websites rated "Green" by WOT
VTzilla (Free) -
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VTzilla is a Mozilla Firefox browser plugin that simplifies the process of scanning Internet resources with VirusTotal. It allows you to download files directly with VirusTotal's web application prior to storing them in your PC. Moreover, it will not only scan files, but also URLs.
The scanning options are embedded in Firefox's context menu and download dialog, making the analysis process as easy as clicking a single button.
More Info
Adblock Plus (Free) -
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Adblock is a content-filtering extension for Mozilla Firefox- and Mozilla Application Suite-based web browsers. Adblock allows users to prevent page elements, such as advertisements, from being downloaded and displayed.
LastPass (Free) -
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LastPass is an online password manager and form filler that makes web browsing easier and more secure.
This are the 4 plugins that you should try...
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Are you using ESS 5 HIPS with the default settings?