Force Safe Search

Force Safe Search turns on the safest search settings available on search engines such as Google, Reddit, YouTube, Bing, Yahoo, DuckDuckGo, and more. Users cannot override the safe search settings enforced by this plug-in.
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manifest.json
{
  "manifest_version": 2,
  "name": "Force Safe Search",
  "author": "Bill Hayden",
  "version": "1.6",
  "description": "Force Safe Search on all major search engines: Google, YouTube, Yahoo, Bing, Yandex, Dogpile, Reddit, Ixquick, and DuckDuckGo",
  "icons": {
    "44": "icon44.png",
    "50": "icon50.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "all_frames": true,
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "cookies",
    "nativeMessaging"
  ],
  "-ms-preload": {
    "backgroundScript": "backgroundScriptsAPIBridge.js",
    "contentScript": "contentScriptsAPIBridge.js"
  }
}