Examine source code of WikiFixer

{
  "description": "Fixes new Vector theme of WikiMedia",
  "manifest_version": 2,
  "name": "WikiFixer",
  "version": "0.4",
  "homepage_url": "https://github.com/fcalvet/WikiFixer",
  "icons": {},
  "content_scripts": [
    {
      "matches": [
        "*://*.wikipedia.org/*",
        "*://*.wiktionary.org/*"
      ],
      "js": [
        "fixer.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c20f48c-99a7-4e25-977f-908148b5de1b}"
    }
  }
}