Examine source code of KosherPlay

{
  "description": "KP Image filtering",
  "manifest_version": 2,
  "name": "KosherPlay",
  "version": "1.9",
  "icons": {
    "48": "favicon.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "./js/register.js",
      "./js/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "kosherplay@aysko.com"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.kosherplay.com/*"
      ],
      "js": [
        "./js/borderify.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "*://*.kosherplay.com/*"
      ],
      "css": [
        "./css/content.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./js/titleManipulator.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./js/titleManipulator.js"
      ],
      "run_at": "document_start"
    }
  ]
}