Examine source code of ImagePreviewer

{
  "name": "ImagePreviewer",
  "version": "5.10.4resigned1",
  "manifest_version": 2,
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "jid1-6GPMG7Najm4Jgg@jetpack"
    }
  },
  "description": "__MSG_DESCRIPTION__",
  "homepage_url": "http://far.whochan.com/",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon96.png"
  },
  "background": {
    "page": "index.html"
  },
  "options_ui": {
    "chrome_style": false,
    "open_in_tab": true,
    "page": "options.html"
  },
  "page_action": {
    "default_title": "ImagePreviewer",
    "default_icon": "buttons/enabled.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "notifications",
    "http://*/*",
    "https://*/*",
    "tabs"
  ],
  "content_scripts": [
    {
      "run_at": "document_idle",
      "all_frames": false,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/WHO.extension.client.js",
        "includes/api.LinkFilter.js",
        "includes/usoCommon.js",
        "includes/usoImagePreviewer.js",
        "includes/WHO.activate.js"
      ]
    }
  ]
}