faircoin-calculator/extension/manifest.json

{
  "manifest_version": 2,
  "name": "FairCoin Calculator",
  "version": "1.2",
  "permissions": [
    "webRequest",
    "<all_urls>",
    "*://api.fairplayground.info/*"
  ],
  "content_scripts": [
    {
      "matches": [
		  "https://chain.fair.to/address*",
		  "https://chain.fair-coin.org/address/*"
      ],
      "js": [ "jquery-3.3.1.min.js", "extension.js" ]
    }
  ],
  "gecko": {
    "id": "faircoin-calculator@mayel.space"
  }
}