Examine source code of DuckDuckGoSafeSearchOff

{
  "manifest_version": 2,
  "name": "DuckDuckGoSafeSearchOff",
  "short_name": "DuckDuckGoSafesearchOff",
  "description": "__MSG_description__",
  "version": "1.0",
  "default_locale": "en",
  "icons": {
    "16": "img/16.png",
    "32": "img/32.png",
    "64": "img/64.png",
    "128": "img/128.png"
  },
  "web_accessible_resources": [
    "img/*.png"
  ],
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "background": {
    "scripts": [
      "main.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1f87033e-6290-4f8b-add8-165d86b72f01}"
    }
  }
}