Examine source code of Dawn on the Blue Planet

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "version": "1.0.0",
  "name": "Dawn on the Blue Planet",
  "theme": {
    "images": {
      "theme_ntp_background": "theme_ntp_background.png"
    },
    "colors": {
      "frame": [
        202,
        202,
        181
      ],
      "ntp_background": [
        121,
        146,
        143
      ],
      "tab_text": [
        202,
        202,
        181
      ],
      "tab_background_text": [
        5,
        8,
        10
      ],
      "bookmark_text": [
        202,
        202,
        181
      ],
      "ntp_text": [
        5,
        8,
        10
      ],
      "ntp_link": [
        6,
        55,
        116
      ],
      "ntp_header": [
        150,
        150,
        150
      ],
      "toolbar": [
        100,
        106,
        91
      ],
      "toolbar_text": [
        202,
        202,
        181
      ],
      "button_background": [
        0,
        0,
        0,
        0
      ],
      "toolbar_button_icon": [
        202,
        202,
        181
      ]
    },
    "tints": {},
    "properties": {
      "ntp_background_alignment": "center",
      "ntp_background_repeat": "no-repeat"
    }
  },
  "description": "A majestic moment of Earth from space, as the first light of the Sun bathes our blue planet."
}