Examine source code of responsiveLayout

{
  "manifest_version": 2,
  "name": "responsiveLayout",
  "description": "Will make the layout of the page change as the text size increases so that the page is more readable.",
  "version": "1.0",
  "icons": {
    "16": "images/logo.png",
    "48": "images/logo.png",
    "128": "images/logo.png"
  },
  "permissions": [
    "storage"
  ],
  "page_action": {
    "default_icon": {
      "16": "images/logo.png",
      "48": "images/logo.png",
      "128": "images/logo.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.cardiff.ac.uk/*"
      ],
      "js": [
        "dist/ts/main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b8be4341-0a97-4a20-b6d0-9566bb5e4d67}"
    }
  }
}