1. Add profile.setPreference("extensions.checkCompatibility", false); profile.setPreference("extensions.checkUpdateSecurity", false); before starting the Firefox profile.
2. Add user_pref("extensions.checkCompatibility", false); and user_pref("extensions.checkUpdateSecurity", false); to perf.js under Firefox profile folder.
3. Try the extension disable_add_on_compatibility_checks-1.3-fx+fn+sm+tb.xpi.