Examine source code of It's Spring Time!

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#FFF5D9",
      "tab_background_text": "#FFF5D9"
    }
  },
  "version": "2.0",
  "name": "It's Spring Time!",
  "manifest_version": 2,
  "description": "It's finally here! Time to put away the heavy jackets and do your spring cleaning~"
}