Examine source code of Web Site Filter

{
  "manifest_version": 2,
  "name": "Web Content Filter (within your Browser)",
  "version": "1.6.4",
  "description": "A content filter for websites, emulating dansguardian’s score-based filter in JavaScript.",
  "short_name": "Web Content Filter",
  "author": "serv-inc",
  "homepage_url": "https://github.com/serv-inc/JSGuardian",
  "applications": {
    "gecko": {
      "id": "@wsf"
    }
  },
  "icons": {
    "128": "filter.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "settings.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "get_text_script.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "storage": {
    "managed_schema": "schema.json"
  }
}