Examine source code of Text Grabber

{
  "manifest_version": 2,
  "name": "Text Grabber",
  "version": "1.0.2resigned1",
  "description": "Selects a configurable element from a web page and copies its text to the clipboard.",
  "browser_action": {
    "default_title": "Text Grabber",
    "default_icon": {
      "16": "/static/images/icon-16.png",
      "48": "/static/images/icon-48.png",
      "128": "/static/images/icon-128.png"
    }
  },
  "icons": {
    "16": "/static/images/icon-16.png",
    "48": "/static/images/icon-48.png",
    "128": "/static/images/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "/lib/browser-polyfill.js",
      "/src/background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "/src/settings/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{97dbcfa3-c8c7-4504-8be3-ba8b0d7f8ff4}"
    }
  }
}