Examine source code of blue1

{
  "name": "blue1",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot_2021-02-04 Theme generate Developer Hub Add-ons for Firefox.png"
    },
    "colors": {
      "frame": "rgba(0, 41, 102, 0.67)",
      "tab_background_text": "rgba(124, 168, 179, 1)",
      "toolbar": "rgba(92, 123, 153, 1)",
      "bookmark_text": "rgba(70, 81, 115, 1)",
      "toolbar_field": "rgba(16, 31, 74, 0.44)",
      "toolbar_field_text": "rgba(95, 151, 179, 0.72)"
    }
  }
}