Examine source code of MJP SAFE-ID-Viewer

{
  "manifest_version": 2,
  "name": "MJP SAFE-ID-Viewer",
  "version": "1.1",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{563248f1-9832-4e13-a7d4-8deaa2ed9c29}"
    }
  }
}