Examine source code of startdays

{
  "name": "SKYLIGHT",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "𝐝𝐞𝐬𝐤𝐭𝐨𝐩 𝐰𝐚𝐥𝐥𝐩𝐚𝐩𝐞𝐫🕊🦋.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(9, 240, 209, 1)",
      "bookmark_text": "rgba(17, 46, 51, 1)",
      "toolbar_field": "rgba(235, 221, 221, 1)",
      "tab_line": "rgba(74, 9, 87, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc3a4cb6-f5ae-47de-914c-bed633b8a833}"
    }
  }
}