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manifest.json
{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "version": "1.1",
  "name": "Mario Retro",
  "theme": {
    "images": {
      "theme_frame": "images/theme_frame.png",
      "theme_frame_inactive": "images/theme_frame_inactive.png",
      "theme_toolbar": "images/theme_toolbar.png",
      "theme_ntp_background": "images/theme_ntp_background.png",
      "theme_ntp_attribution": "images/theme_ntp_attribution.png"
    },
    "colors": {
      "frame": [
        56,
        161,
        183
      ],
      "frame_inactive": [
        172,
        220,
        230
      ],
      "frame_incognito": [
        41,
        120,
        137
      ],
      "frame_incognito_inactive": [
        148,
        190,
        192
      ],
      "toolbar": [
        41,
        120,
        137
      ],
      "tab_text": [
        255,
        255,
        255
      ],
      "tab_background_text": [
        0,
        0,
        0
      ],
      "bookmark_text": [
        255,
        255,
        255
      ],
      "ntp_background": [
        56,
        161,
        183
      ],
      "ntp_text": [
        0,
        0,
        0
      ],
      "ntp_link": [
        255,
        255,
        255
      ],
      "ntp_link_underline": [
        0,
        0,
        0
      ],
      "ntp_header": [
        0,
        0,
        0
      ],
      "ntp_section": [
        56,
        161,
        183
      ],
      "ntp_section_text": [
        255,
        255,
        255
      ],
      "ntp_section_link": [
        0,
        0,
        0
      ],
      "ntp_section_link_underline": [
        255,
        255,
        255
      ],
      "control_background": [
        255,
        255,
        255
      ],
      "button_background": [
        56,
        161,
        183
      ]
    },
    "tints": {
      "buttons": [
        1,
        1,
        1
      ],
      "frame": [
        -1,
        -1,
        -1
      ],
      "frame_inactive": [
        -1,
        -1,
        0.75
      ],
      "frame_incognito": [
        -1,
        0.2,
        0.35
      ],
      "frame_incognito_inactive": [
        -1,
        0.3,
        0.6
      ],
      "background_tab": [
        -1,
        0.5,
        0.75
      ]
    },
    "properties": {
      "ntp_background_alignment": "center bottom",
      "ntp_background_repeat": "no-repeat",
      "ntp_logo_alternate": 0
    }
  }
}