Examine source code of Funky Red Circles

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "CIRCLES",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(31, 34, 61, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(151, 24, 24)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(61, 61, 61)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgba(255, 0, 0, 0.54)",
      "frame_inactive": "rgba(236, 17, 17, 0.54)",
      "ntp_background": "rgba(255, 0, 0, 0.54)",
      "popup_border": "rgba(255, 0, 0, 0.54)",
      "sidebar_border": "rgba(236, 17, 17, 0.54)",
      "tab_loading": "rgb(61, 61, 61)"
    }
  }
}