Examine source code of Hope.....

{
  "name": "Hope.....",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "HopeH1.jpg"
    },
    "colors": {
      "frame": "rgba(67, 68, 67, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(70, 71, 70, 0)",
      "bookmark_text": "rgba(255, 250, 250, 1)",
      "toolbar_field": "rgba(70, 71, 70, 0.06)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(245, 226, 130, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{05219dad-2c1e-40f8-a223-8efc84c74419}"
    }
  }
}