Examine source code of QuickMAL

{
  "manifest_version": 2,
  "name": "quickmal",
  "version": "1.1",
  "description": "A quick entry-point to edit your MAL entries without having to be in the site",
  "permissions": [
    "storage",
    "identity",
    "https://myanimelist.net/v1/*",
    "https://api.myanimelist.net/v2/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "danielstoyanov@quickmal.xyz"
    }
  },
  "browser_action": {
    "default_title": "QuickMAL",
    "default_popup": "index.html"
  },
  "icons": {
    "16": "/icons/icon-16.png",
    "32": "/icons/icon-32.png",
    "64": "/icons/icon-64.png",
    "128": "/icons/icon-128.png"
  }
}