Examine source code of BFA (BetterFurAffinity)

{
  "manifest_version": 2,
  "name": "BFA (BetterFurAffinity)",
  "short_name": "BFA",
  "version": "0.5",
  "description": "Tweaks and improves FurAffinity experience.",
  "icons": {
    "16": "resources/icon-16.png",
    "32": "resources/icon-32.png",
    "48": "resources/icon-48.png",
    "128": "resources/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.furaffinity.net/*"
      ],
      "js": [
        "js/vxshare.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "*://*.furaffinity.net/*"
  ],
  "author": "xinitrc",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f49c54f1-4874-4bab-98c8-dc91921a2d2c}"
    }
  }
}