Examine source code of No, thanks.

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "short_name": "__MSG_extensionDescription__",
  "default_locale": "en",
  "version": "0.1.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "author": "Daniel Kladnik @ kiboke studio",
  "permissions": [
    "tabs",
    "storage",
    "http://*/*",
    "https://*/*",
    "notifications",
    "webRequest",
    "webRequestBlocking",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "data/extension.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.no-thanks-extension.com/*"
      ],
      "js": [
        "data/home-proxy.js"
      ]
    }
  ],
  "options_ui": {
    "page": "data/options.html"
  },
  "browser_action": {
    "default_popup": "data/menu/index.html",
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png"
    }
  }
}