Examine source code of Qversi

{
  "manifest_version": 2,
  "name": "Qversi",
  "version": "0.1.4resigned1",
  "author": "Portugalball",
  "description": "Adds an icon to the toolbar that lets one see if there's any quickly available matches at reversi.dietchan.org",
  "homepage_url": "https://reversi.dietchan.org",
  "icons": {
    "48": "icons/reversi-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/0-16.png",
    "default_title": "International Reversi Queue",
    "default_popup": "popup/popup.html"
  },
  "web_accessible_resources": [
    "popup/flags.png",
    "popup/flags.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{48b866ae-d2a7-4ffb-aa2d-3a6dba95ba08}"
    }
  }
}