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I'm not sure how sudden the push for HTTPS is, but in my opinion it is a good thing. HTTPS means that your browser connection is secure, hence the "S". That is usually the case when you log in at most sites anyway, but the problem is that after login, they usually revert back to an unsecured HTTP connection. I assume that the plugin is available for Firefox because of the Firesheep plugin exists for Firefox. Firesheep examines network traffic and searches for unsecure cookies that it can use to spoof your username/password. The HTTPS Everywhere campaign is a push by the Electronic Freedom Foundations to both encourage individuals to use the HTTPS Everywhere plugin for Firefox and encourage popular website to provide secure connections.