Examine source code of Tarderase

{
  "description": "Cleans up UAH",
  "manifest_version": 2,
  "name": "Tarderase",
  "version": "1.3.1",
  "applications": {
    "gecko": {
      "id": "tarderase@example.com"
    }
  },
  "icons": {
    "16": "img/icon_16x16.png",
    "48": "img/icon_48x48.png",
    "128": "img/icon_128x128.png"
  },
  "homepage_url": "https://www.homepix.com",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "19": "img/icon_19x19.png",
      "38": "img/icon_38x38.png"
    },
    "default_title": "Tarderase",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.drroyspencer.com/20*"
      ],
      "js": [
        "content_scripts/content.js"
      ],
      "css": [
        "content_scripts/style.css"
      ]
    }
  ]
}