Firekeeper 0.3.1(alpha release)

Firekeeper is an Intrusion Detection and Prevention System for Firefox. It is able to detect, block and warn the user about malicious sites. Firekeeper uses flexible rules similar to Snort ones to describe browser based attack attempts. Rules can also be used to effectively filter different kinds of unwanted content.

Features of Firekeeper include:

Ability to scan HTTP(S) request URL, response headers and body, and to cancel processing of suspicious requests
Encrypted and compressed responses are scanned after decryption/decompression
Privacy friendly - no data is send to external servers, all scanning is done on the local computer
Very fast pattern matching algorithm (taken directly from Snort).
Interactive, verbose alerts that give an ability to choose a response to detected attack attempt.
A detailed view of suspicious response headers and body
Event logging
Ability to use any number of files with rules and to automatically load files from remote locations