Examine source code of ReadMoreRemover

{
  "manifest_version": 2,
  "name": "ReadMoreRemover",
  "version": "2.6resigned1",
  "description": "Triggers Continue Reading links on www.huffingtonpost.com for Firefox on Android",
  "icons": {
    "48": "icons/remover.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.huffingtonpost.com/*",
        "*://*.huffpost.com/*",
        "*://*.huffingtonpost.co.uk/*",
        "*://*.aol.com/*",
        "*://qz.com/*",
        "*://*.thejournal.ie/*",
        "*://*.inquisitr.com/*"
      ],
      "js": [
        "remover.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6de17480-b9c3-48cd-864b-dd984e147a11}"
    }
  }
}