[bdisraeli]

HTTPS Everywhere[1]. Using SSL certificates helps prevent man-in-the-middle attacks[2], such as this. Comcast wouldn't be able to read any of your traffic and insert js without spoofing SSL certificates.

[1] https://chrome.google.com/webstore/detail/https-everywhere/g...

[2] http://security.stackexchange.com/questions/8145/does-https-...