Examine source code of Hello Lilly

{
  "theme": {
    "images": {
      "theme_frame": "Lilly-FoxHeader.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Hello Lilly",
  "manifest_version": 2,
  "description": "My lovely cat Lilly died last March, but she lives on in pictures like this."
}