Examine source code of Redberry

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Redberry",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(188, 17, 17)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(182, 9, 9)",
      "tab_background_text": "rgb(255, 234, 222)",
      "toolbar_field": "rgb(173, 40, 40)",
      "toolbar_field_text": "rgb(255, 184, 144)",
      "tab_line": "rgb(175, 12, 12)",
      "popup": "rgb(94, 11, 11)",
      "popup_text": "rgb(255, 171, 171)",
      "icons": "rgb(255, 172, 172)",
      "tab_loading": "rgb(175, 12, 12)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4106f88d-602d-40dc-a4b9-3c47e412ab71}"
    }
  }
}