Examine source code of Submerged Tundra

{
  "theme": {
    "images": {
      "theme_frame": "chill.jpg"
    },
    "colors": {
      "frame": "#191585",
      "tab_background_text": "#f4f4f7"
    }
  },
  "version": "2.0",
  "name": "Submerged Tundra",
  "manifest_version": 2,
  "description": "One icy winter, a tsunami crashes upon the frosty banks of an arctic island. Frothy, frigid waters splash forcefully onto sub-zero layers of snow and ice, resulting in a gigantic avalanche! Shards of hard-packed snow slip layer-by-layer into the ocean, as if choreographed by the sea. Under the Big-Blue, frozen layers continue to disintegrate in icy waves. The sea pushes onward, though, seeking to crack another iceberg."
}