Examine source code of Frame by Frame Viewer

{
  "manifest_version": 2,
  "name": "Frame by Frame Viewer",
  "version": "1.0",
  "description": "View videos frame by frame.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c387006b-50e4-4223-85a9-9527ebc0dc9c}"
    }
  }
}