Examine source code of flowering

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "flowering",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(72, 192, 225, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0.31)",
      "toolbar_field_text": "rgb(57, 215, 234)",
      "tab_line": "rgb(30, 137, 173)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(236, 133, 125)",
      "tab_loading": "rgb(30, 137, 173)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{65f21862-b2de-4123-a68a-e475b031550e}"
    }
  }
}