Examine source code of Screen Info

{
  "manifest_version": 2,
  "name": "Screen Info",
  "version": "1.2.1",
  "description": "Inspect viewport device pixel ratio and CSS breakpoints",
  "browser_specific_settings": {
    "gecko": {
      "id": "{eece96e2-8f2a-42cd-85bc-f99fe6e283e7}",
      "strict_min_version": "96.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "static/p16.png",
    "32": "static/p32.png",
    "48": "static/p48.png",
    "96": "static/p96.png",
    "128": "static/p128.png"
  },
  "browser_action": {
    "default_popup": "popup/index.html",
    "default_icon": {
      "16": "static/p16.png",
      "32": "static/p32.png",
      "48": "static/p48.png",
      "96": "static/p96.png",
      "128": "static/p128.png"
    }
  },
  "background": {
    "scripts": [
      "lib/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "activeTab"
  ]
}