Uncaught ReferenceError: WebKitBlobBuilder is not defined

[Former user]

Chrome Version 24.0.1312.0 (164667) Linux I get the title error message and three more: Error in event handler for 'undefined': BlobBuilder is not defined ReferenceError: BlobBuilder is not defined at Object.FileEntry.file (chrome-extension://lfjbhpnjiajjgnjganiaggebdhhpnbih/FauxFilesystem.js:137:17) at Object.Gito.FileUtils.readFileEntry (chrome-extension://lfjbhpnjiajjgnjganiaggebdhhpnbih/file_utils.js:142:14) at chrome-extension://lfjbhpnjiajjgnjganiaggebdhhpnbih/file_utils.js:149:20 at Object.DirectoryEntry.getFile (chrome-extension://lfjbhpnjiajjgnjganiaggebdhhpnbih/FauxFilesystem.js:80:5) at Object.Gito.FileUtils.readFile (chrome-extension://lfjbhpnjiajjgnjganiaggebdhhpnbih/file_utils.js:148:9) at Object.ProjectManager.checkResourceContent (chrome-extension://lfjbhpnjiajjgnjganiaggebdhhpnbih/ProjectManager.js:85:20) at chrome-extension://lfjbhpnjiajjgnjganiaggebdhhpnbih/background.js:19:24 at chrome.Event.dispatchToListener (event_bindings:387:21) at chrome.Event.dispatch_ (event_bindings:373:27) at chrome.Event.dispatch (event_bindings:393:17)