Examine source code of LM Website Font Changer

{
  "manifest_version": 2,
  "name": "LM Website Font Changer",
  "version": "1.0",
  "description": "Changes the font of the Lm2606 website.",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.lm2606.co.uk/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0a334946-113e-4fd2-b601-0ea61c563859}"
    }
  }
}