Examine source code of WTF? Search

{
  "manifest_version": 2,
  "name": "WTF? Search",
  "version": "1.0.0",
  "description": "A browser extension for searching multiple sites quickly and easily",
  "permissions": [
    "downloads",
    "storage",
    "*://wtfsearch.s3-us-west-1.amazonaws.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bac3e180-972b-469f-99c0-7bc8f7bef322}",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "64": "/assets/AppIconBlack.svg",
    "128": "/assets/AppIconBlack.svg",
    "256": "/assets/AppIconBlack.svg"
  },
  "browser_action": {
    "default_title": "WTF? Search",
    "default_popup": "/src/popup.html",
    "theme_icons": [
      {
        "light": "/assets/AppIconGray.svg",
        "dark": "/assets/AppIconBlack.svg",
        "size": 32
      }
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://wtfsearch.app/*"
      ],
      "js": [
        "/src/home-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "/src/background.js"
    ]
  }
}