Examine source code of Itch display information

{
  "manifest_version": 2,
  "name": "itch display information",
  "version": "1.2",
  "description": "Shows the informations of a game in the left upper corner easily visible. Does not work inside itch.io/randomizer because of respectable and good security measures!",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.itch.io/*"
      ],
      "js": [
        "itch_display_information.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "itchdisplayinformation@example.com",
      "strict_min_version": "58.0"
    }
  }
}