Examine source code of PropMate

{
  "manifest_version": 2,
  "name": "PropMate",
  "description": "Enhance property browsing experience on Trademe",
  "version": "0.10.3",
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "PropMate",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.trademe.co.nz/*",
        "*://*.myrent.co.nz/*",
        "*://*.oneroof.co.nz/*",
        "*://*.realestate.co.nz/*"
      ],
      "run_at": "document_end",
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "https://maps.googleapis.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5d1bffbf-d658-4f89-8a7e-648c210b44a7}"
    }
  }
}