Examine source code of URL Parameters Editor

{
  "manifest_version": 2,
  "name": "Parameters Editor",
  "version": "1.7",
  "description": "Shows parameters used in the URL and allows to update, export and import them ",
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "src/background.js",
      "src/common.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_title": "Show/Edit parameter for this URL",
    "default_icon": "images/icon.png",
    "default_popup": "src/popup.html"
  },
  "options_ui": {
    "page": "src/options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "icons": {
    "128": "images/icon128.png"
  }
}