Examine source code of Manipulist 3DViewer

{
  "manifest_version": 2,
  "name": "Manipulist 3DViewer",
  "description": "Quick link to Manipulist 3DViewer, the web-based 3D viewer.",
  "version": "1.2resigned1",
  "homepage_url": "https://www.manipulist.com/",
  "icons": {
    "48": "icons/logo-48.png",
    "96": "icons/logo-96.png"
  },
  "browser_action": {
    "default_icon": "icons/logo-32.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{93256482-e41a-49fd-9918-7cfcfe2eec5b}"
    }
  }
}