Examine source code of https://addons.flores.org

{
  "name": "3a5fda633197f2e6e40ec074464d19b0",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "3a5fda633197f2e6e40ec074464d19b0.gif"
    },
    "colors": {
      "frame": "rgba(182, 234, 245, 1)",
      "tab_background_text": "rgba(119, 41, 179, 1)",
      "bookmark_text": "rgba(51, 56, 184, 0.65)",
      "toolbar_field": "rgba(113, 201, 163, 0.15)",
      "toolbar_field_text": "rgba(33, 219, 197, 1)"
    }
  }
}