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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.0.0",
  "name": "Developer Edition",
  "manifest_version": 2,
  "theme": {
    "colors": {
      "frame": [
        0,
        0,
        0
      ],
      "toolbar": [
        50,
        50,
        52
      ],
      "tab_text": [
        255,
        255,
        255
      ],
      "frame_inactive": [
        10,
        10,
        10
      ],
      "bookmark_text": [
        190,
        190,
        190
      ],
      "ntp_background": [
        190,
        190,
        190
      ],
      "button_background": [
        255,
        255,
        255,
        0
      ],
      "tab_background_text": [
        128,
        128,
        128
      ]
    },
    "tints": {
      "buttons": [
        0,
        0,
        0.75
      ]
    }
  }
}