Examine source code of k-on ♥

{
  "name": "k-on ♥",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Capture001.png"
    },
    "colors": {
      "frame": "rgba(255, 184, 205, 1)",
      "tab_background_text": "rgba(255, 143, 199, 0.96)",
      "toolbar": "rgba(255, 212, 218, 0.48)",
      "bookmark_text": "rgba(255, 148, 193, 1)",
      "toolbar_field": "rgba(255, 254, 240, 1)",
      "toolbar_field_text": "rgba(255, 199, 222, 1)",
      "tab_line": "rgba(255, 158, 179, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3c104514-d59b-49c6-b0d0-b65e18e60185}"
    }
  }
}