This is fixable. You probably don't have permissions for this add-on configured correctly.

To fix:
1. Head to Google (google.com)
2. Click on the Extensions button to the right of your URL bar (the button looks like a puzzle piece)
3. Right-click on this extension's icon
4. Change the "Extension can read and change data" setting to "Always Allow"
5. Refresh the page
6. Extension will now work

Hope this helps!