Examine source code of flip-text

{
  "manifest_version": 2,
  "name": "flip-text",
  "version": "1.0",
  "description": "Flip Ethereum and Ether words on web pages",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "mark.min.js",
        "flip-text.js"
      ]
    }
  ]
}