Examine source code of Your Joking

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Your Joking",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(2, 3, 17)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(241, 11, 11)",
      "toolbar_field": "rgb(2, 3, 17)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(241, 11, 11)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(255, 255, 255)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(138, 189, 130)",
      "popup_border": "rgb(45, 219, 18)",
      "popup_highlight_text": "rgb(155, 199, 215)",
      "sidebar_border": "rgb(241, 11, 11)",
      "sidebar_highlight": "rgb(118, 195, 239)",
      "tab_loading": "rgb(241, 11, 11)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0330be5c-836a-4815-ab25-b32d72cb4ed0}"
    }
  }
}