Examine source code of Just RSS Viewer

{
  "manifest_version": 2,
  "name": "Just RSS Viewer",
  "version": "1.2",
  "description": "View and manage your RSS feeds quickly from the toolbar.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8739823f-5d40-4e88-b078-25bbd5aae5d9}",
      "strict_min_version": "80.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "https://*/",
    "http://*/"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "Just RSS Viewer",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}