Dark Space

Simply space. But dark. Link to image source: https://i.imgur.com/GCJRhiA.png UPDATE: Changed color of background tabs…
Premium users can view and search full source code, and see the source code differences between two versions.
Upgrade to premium
manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "theme": {
    "images": {
      "theme_frame": "images/theme_frame.png",
      "theme_toolbar": "images/theme_toolbar.png",
      "theme_tab_background": "images/theme_tab_background.png",
      "theme_ntp_background": "images/theme_ntp_background.png"
    },
    "colors": {
      "frame": [
        66,
        116,
        201
      ],
      "toolbar": [
        0,
        0,
        0
      ],
      "tab_text": [
        255,
        255,
        255
      ],
      "tab_background_text": [
        252,
        252,
        255
      ],
      "bookmark_text": [
        255,
        255,
        255
      ],
      "ntp_background": [
        0,
        0,
        0
      ],
      "ntp_text": [
        255,
        255,
        255
      ],
      "button_background": [
        0,
        0,
        0,
        0
      ]
    },
    "tints": {
      "buttons": [
        0,
        0,
        1
      ]
    },
    "properties": {
      "ntp_background_alignment": "bottom",
      "ntp_background_repeat": "no-repeat"
    }
  },
  "name": "Dark Space",
  "version": "2",
  "description": ""
}