Examine source code of Discord Colours

{
  "name": "Discord Colours",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "discord-logo_5f392f28c2fb0.png"
    },
    "colors": {
      "frame": "rgba(49, 51, 56, 1)",
      "tab_background_text": "rgba(238, 179, 47, 1)",
      "toolbar": "rgba(35, 36, 41, 1)",
      "bookmark_text": "rgba(238, 179, 47, 1)",
      "toolbar_field": "rgba(238, 179, 47, 1)",
      "toolbar_field_text": "rgba(49, 51, 56, 1)",
      "tab_line": "rgba(238, 179, 47, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{06d5bd17-1af5-4cc6-b093-949bcfd76a06}"
    }
  }
}