Examine source code of rainbow

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "rainbow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(189, 26, 26, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(212, 41, 41)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(249, 215, 0, 0)",
      "toolbar_field_text": "rgb(238, 238, 238)",
      "tab_line": "rgba(210, 0, 0, 0)",
      "popup": "rgba(0, 0, 0, 0.18)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(0, 0, 0)",
      "button_background_hover": "rgba(255, 255, 255, 0.05)",
      "icons_attention": "rgba(249, 249, 249, 0.05)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(255, 255, 255)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(0, 0, 0)",
      "popup_highlight_text": "rgba(255, 4, 4, 0)",
      "tab_loading": "rgb(121, 0, 59)",
      "tab_text": "rgb(255, 255, 255)"
    }
  }
}