Examine source code of AutoMapLinker

{
  "manifest_version": 3,
  "name": "AutoMapLinker",
  "description": "Automatically links to job posting locations on Indeed",
  "version": "1.0",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "action": {
    "default_icon": "images/icon-48.png"
  },
  "content_scripts": [
    {
      "js": [
        "indeed.js"
      ],
      "matches": [
        "https://www.indeed.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "automaplinker@beansquared.com"
    }
  }
}