Comment 1 for bug 1360277

Same here on Windows, Firefox 35.0.1.

browser console log:
Use of getPreventDefault() is deprecated. Use defaultPrevented instead. jquery-1.6.2.min.js:17
ReferenceError: File is not defined Firefogg.js:154
NS_ERROR_XPC_JAVASCRIPT_ERROR_WITH_DETAILS: [JavaScript Error: "File is not defined" {file: "file:///C:/Users/Francesco/AppData/Roaming<email address hidden>/components/Firefogg.js" line: 154}]'[JavaScript Error: "File is not defined" {file: "file:///C:/Users/Francesco/AppData/Roaming<email address hidden>/components/Firefogg.js" line: 154}]' when calling method: [nsIFirefogg::selectVideo]

I have already tried reinstalling firefox or the extension.