Enable/disable toggling is buggy in Firefox 15
via the toolbar icon or via the menu (tools--https everywhere-->disable https everywhere) a) clicking on disable https everywhere causes the current tab to refresh, which it's always done b) click on toolbar icon and note that the rulesets are still listed as enabled c) load another page that triggers rulesets. note that the rule sets are no longer listed as active and "enable https everywhere" appears.
I can still disable the addon itself from the addon manager.
3.0b4, ff aurora, mac 10.6.8