Examine source code of Bing to StartPage

{
  "manifest_version": 2,
  "name": "Bing to StartPage",
  "version": "1.0",
  "description": "Bing to DuckduckGo combined with Edge deflector (https://github.com/da2x/EdgeDeflector) lets you search privately through cortana tool bar with DuckduckGo instead of Bing.",
  "homepage_url": "https://github.com/louisgrasset/bing-to-duckduckgo",
  "icons": {
    "16": "/icons/icon-16.png",
    "32": "/icons/icon-32.png",
    "48": "/icons/icon-48.png",
    "96": "/icons/icon-96.png",
    "128": "/icons/icon-128.png",
    "256": "/icons/icon-256.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://bing.com/*",
    "https://*.bing.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "bingtostartpage@dfsek.github.io",
      "strict_min_version": "54.0"
    }
  },
  "author": "dfsek"
}