Examine source code of Ishtar MultiTool

{
  "name": "Ishtar MultiTool",
  "manifest_version": 2,
  "version": "1.0",
  "description": "Improve your Ishtar Collective experience",
  "icons": {
    "16": "img/ishtar_16.png",
    "48": "img/ishtar_48.png",
    "128": "img/ishtar_128.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "img/ishtar_19.png",
      "38": "img/ishtar_38.png"
    },
    "default_popup": "popup.html"
  },
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.ishtar-collective.net/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "/img/*",
    "/d1/*"
  ],
  "permissions": [
    "storage",
    "https://www.ishtar-collective.net/",
    "https://bungie.net/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ishtarmultitool@aioros.net"
    }
  }
}