HTTPS Everywhere >0.2.2 silently fail to work on Firefox 3.0.x
HTTPS Everywhere versions >0.2.2 don't work on the version of Firefox bundled with Debian Lenny (derived from Firefox 3.0.x with backported security fixes, version 0.2.2 works fine). I suspect the problem is with Firefox 3.0.x support in general.
The current version should either be fixed to support Firefox 3.0.x again, or it should refuse to install on these versions. At the moment, it allows the user to install/upgrade to this version and then silently fails to work, causing the unwitting user's security/privacy to be compromised.