Examine source code of Quick Proxy for Startpage

{
  "manifest_version": 2,
  "name": "Quick Proxy for Startpage",
  "version": "1.1",
  "description": "Adds a right-click menu option to instantly open any link in Startpage's secure 'Anonymous View', protecting your privacy with a single click.",
  "permissions": [
    "contextMenus",
    "tabs",
    "https://www.startpage.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.startpage.com/sp/search*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "anonymous-view-helper@potatogamer.uk"
    }
  },
  "icons": {
    "48": "icon.svg",
    "128": "icon.svg"
  }
}