Examine source code of koalaa

{
  "name": "koalaa",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "hinh-nen-thien-nhien-4k-yody-vn-87.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{45d5eb03-6aba-4df8-8bc7-436e5602d911}"
    }
  }
}