Context menu item will be available after set checkbox called *Enable Open With Google Chrome context menu for links* on project site at http://barisderin.com/extension/openwithgc/options.html but the backend command not work correctly on Firefox v56 on Windows.
Could you please send us your operating system, Firefox version and add-on version details to our support email address please so that we can look into problem more thoroughly? If possible, please send us a screenshot of your issue.
