Examine source code of Sims 4 Mod Manager addon

{
  "manifest_version": 2,
  "name": "Sims 4 MM addon",
  "version": "1.0",
  "description": "Allow downloads to go through the app.",
  "content_scripts": [
    {
      "matches": [
        "*://www.loverslab.com/files/file/*",
        "*://modthesims.info/d/*/*.html"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "32": "icon32.png",
    "48": "icon48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extentions@cripplerick.com"
    }
  },
  "browser_action": {
    "default_icon": {
      "32": "icon32.png"
    }
  }
}