Examine source code of Bumstinator

{
  "manifest_version": 2,
  "name": "Bumstinator",
  "description": "Wenn auch du HC Strache lieber Bumsti nennst.",
  "version": "1.2resigned1",
  "applications": {
    "gecko": {
      "id": "bumstinator@gmail.com",
      "strict_min_version": "42.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content_scripts/replacer.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icons/Bumstinator.png",
    "32": "icons/Bumstinator.png",
    "64": "icons/Bumstinator.png",
    "128": "icons/Bumstinator.png",
    "256": "icons/Bumstinator.png",
    "512": "icons/Bumstinator.png"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ]
}