Examine source code of SF User Switcher

{
  "manifest_version": 2,
  "name": "SF User Switcher",
  "description": "Switch easy and fast your Salesforce User",
  "version": "0.79",
  "browser_action": {
    "default_icon": {
      "16": "images/icon-16.png",
      "32": "images/icon-32.png",
      "48": "images/icon-48.png",
      "128": "images/icon-128.png"
    },
    "default_popup": "index.html"
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false,
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.salesforce.com/*",
        "https://*.salesforce-setup.com/*",
        "https://*.force.com/*",
        "https://*.visualforce.com/*",
        "https://*.lightning.force.com/*",
        "https://*.salesforce.mil/*",
        "https://*.force.mil/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "https://*.salesforce.com/*",
    "https://*.salesforce-setup.com/*",
    "https://*.force.com/*",
    "https://*.visualforce.com/*",
    "https://*.lightning.force.com/*",
    "https://*.salesforce.mil/*",
    "https://*.force.mil/*",
    "cookies",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb5ae5b5-277c-4008-a3ee-d9c09c93bd3b}"
    }
  }
}