Examine source code of Simple Startup Minimizer

{
  "manifest_version": 2,
  "name": "Simple Startup Minimizer",
  "description": "This extension will minimize Firefox on startup, it is very simple and I didn't put much work into it but it should work on all platforms. Please let Mohamed Farahat know if you want more features added into it.",
  "version": "0.2.2",
  "author": "Mohamed Farahat",
  "applications": {
    "gecko": {
      "id": "gecko@minimize.at.startup",
      "strict_min_version": "54.0"
    }
  },
  "icons": {
    "16": "images/icon-16px.png",
    "32": "images/icon-32px.png",
    "64": "images/icon-64px.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}