Examine source code of Curate Style Extension

{
  "name": "Curate Extension",
  "description": "Add items to your Curate board from any website.",
  "version": "1.0.5",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Open Curate"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "./modal.css"
      ],
      "js": [
        "./static/js/content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "./static/js/background.js",
      "./static/js/content.js"
    ],
    "persistent": false
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "icons": {
    "16": "curate-logo-16.png",
    "48": "curate-logo-48.png",
    "128": "curate-logo-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9db946c6-945a-4af0-bfa2-8c1501a12d02}"
    }
  }
}