Forcing https on a public site is bad

I'm currently at work and I try to access bugzilla.mozilla.org. I can't because my proxy only lets me access known secure sites (meaning a handfull support sites, banks and that's it). I don't know who got the idea of making bugzilla a secure site by forcing ssl connections to it. The problem des not come from my dns or anything else because I've got review request stating that the protocol be https.
Besised me being pissed-off and unable to reach bugzilla from work, what's the point of having all bugzilla being ssled, this will slow it down badly because the server will have to encrypt all coonectiosn to the site. IT will securise the login/password I agree but it should be kept an option for people like me behind firewall and proxies.