Examine source code of DuckDuckSocial

{
  "manifest_version": 2,
  "name": "DuckDuckSocial",
  "version": "0.0.6",
  "description": "Adds a scrollable list of posts from the social web that match your DuckDuckGo search. Mobile support requires API key",
  "icons": {
    "512": "icons/border-512.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://duckduckgo.com/*"
      ],
      "js": [
        "libs/purify.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "settings.html",
    "default_icon": "icon.png"
  },
  "options_page": "settings.html",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "identity"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "126.0",
      "id": "{b5856715-765d-4a0f-9686-da3932b8c9e5}"
    },
    "gecko_android": {
      "strict_min_version": "126.0"
    }
  }
}