Examine source code of Open in RemovePaywall

{
  "manifest_version": 2,
  "name": "Open in RemovePaywall",
  "version": "1.0",
  "description": "Adds a context menu option to open the current page in removepaywall.com.",
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{40b33d7a-31a4-4aae-b587-c277c73e218b}"
    }
  }
}