Examine source code of Faded Theme

{
  "name": "Faded Theme",
  "version": "0.2resigned1",
  "description": "A simple dynamic theme featuring an animated gradient.",
  "manifest_version": 2,
  "permissions": [
    "theme"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "strict_min_version": "55.0a2",
      "id": "{1e008920-b753-4745-996b-8b4794fc0363}"
    }
  }
}