Bug 9981 (CodeSkulptur - Google APIs) may be back
An old bug (9981) where a Google API rule seems to break CodeSkulptur.org (Used in Coursera.org MOOC classes) seems to be back.
Disabling CodeSkulptur.org rule does not eliminate problem, but disable Google API does. Looking at XML text for CodeSkulptur gets an error "Unable to download source." URL asks for "Filename: null ...src/chrome/content/rules/null. Can successfully get XML for other rules.
Disable ALL, or disable HTTPS-Everywhere also makes problem go away.
FireFox 29.0.1 Win XP SP3+, NoScript 188.8.131.52, HTTPS Everywhere 3.5.1 June 2014.