Examine source code of Generic Font Names Fixer

{
  "manifest_version": 2,
  "name": "Generic Font Names Fixer",
  "version": "1.4",
  "description": "Fix the incorrect generic font-family name",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "gfnf.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{16011679-f749-4af5-8b16-65caf7d855b5}"
    }
  }
}