Examine source code of Feature Remover

{
  "manifest_version": 2,
  "name": "Feature Remover",
  "author": "Xander Jake de los Santos || @xanderjakeq",
  "version": "0.1",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "notifications",
    "storage",
    "https://gumroad-validation.herokuapp.com/",
    "webRequest"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}