Rulesets for the Firefox addon HTTPS Everywhere.
With this you can automatically switch from unsecure http to encrypted https versions of various websites.
And you can create your own rules for new sites, which is what I did for these:
And what to do with these?
Store the XML files in the extension's rules folder of your Firefox profile.
Might look something like this:
C:\Documents and Settings\USER\Application Data\Mozilla\Firefox\Profiles\987XYZ123.default\extensions\email@example.com\chrome\content\rules
Afterwards you have to restart the browser.