Examine source code of reminiapk

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "pink cherry blossom",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(31, 34, 61)",
      "toolbar_text": "rgb(246, 240, 240)",
      "frame": "rgb(8, 11, 33)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(54, 58, 89)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(246, 240, 246)",
      "popup": "rgb(31, 34, 61)",
      "popup_text": "rgb(254, 254, 254)",
      "tab_loading": "rgb(246, 240, 246)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{32c32ef9-2f04-4744-82cc-b5d2db8a29d2}"
    }
  }
}