Examine source code of Showoctocats

{
  "applications": {
    "gecko": {
      "id": "showoctocats@jasp.net"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "default_locale": "en_US",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "64": "icons/icon.png"
  },
  "manifest_version": 2,
  "name": "Showoctocats",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://raw.githubusercontent.com/*"
  ],
  "version": "0.1.1"
}