Examine source code of Centro 365

{
  "manifest_version": 3,
  "name": "Centro 365",
  "short_name": "Centro 365",
  "version": "4.1",
  "author": "Sean O'Sullivan",
  "description": "A better way to manage Microsoft 365",
  "homepage_url": "https://seanosullivan.co.uk/projects/centro365/",
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "assets/logic/background.js"
    ]
  },
  "icons": {
    "16": "assets/appicons/16.png",
    "24": "assets/appicons/24.png",
    "32": "assets/appicons/32.png",
    "64": "assets/appicons/64.png",
    "128": "assets/appicons/128.png",
    "256": "assets/appicons/256.png",
    "512": "assets/appicons/512.png"
  },
  "action": {
    "default_icon": {
      "16": "assets/appicons/16.png",
      "24": "assets/appicons/24.png",
      "32": "assets/appicons/32.png"
    },
    "default_title": "Centro 365",
    "default_popup": "index.html"
  },
  "omnibox": {
    "keyword": "c365"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "mac": "MacCtrl+Shift+Up",
        "windows": "Ctrl+Shift+Up",
        "linux": "Ctrl+Shift+Up",
        "default": "Ctrl+Shift+Up"
      },
      "description": "Open the extension"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{23213517-1656-4794-96d9-349d58610e91}",
      "strict_min_version": "125.0"
    }
  }
}