Examine source code of Backcorn

{
  "manifest_version": 2,
  "version": "2.2",
  "name": "backcorn",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(221, 14, 14, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(16, 16, 17, 0.53)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.68)",
      "tab_line": "rgb(33, 153, 17)",
      "popup": "rgb(72, 67, 67)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(99, 229, 59, 0.85)",
      "button_background_hover": "rgba(255, 2, 2, 0.78)",
      "ntp_background": "rgb(219, 212, 212)",
      "ntp_text": "rgb(0, 0, 0)",
      "popup_border": "rgb(8, 252, 29)",
      "popup_highlight_text": "rgba(181, 177, 177, 0.51)",
      "popup_highlight": "rgb(58, 163, 23)",
      "sidebar_border": "rgba(16, 159, 135, 0.87)",
      "sidebar_highlight_text": "rgba(23, 110, 44, 0.36)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(78, 73, 73)",
      "tab_background_separator": "rgb(255, 0, 0)",
      "tab_selected": "rgba(15, 25, 25, 0.78)",
      "tab_text": "rgb(13, 245, 69)",
      "toolbar_bottom_separator": "rgb(174, 23, 23)",
      "toolbar_field_border_focus": "rgb(102, 250, 0)",
      "toolbar_field_border": "rgb(35, 250, 238)",
      "toolbar_field_focus": "rgb(66, 63, 64)",
      "toolbar_field_highlight_text": "rgba(255, 255, 255, 0.99)",
      "toolbar_field_highlight": "rgba(129, 245, 29, 0.8)",
      "toolbar_top_separator": "rgb(94, 178, 178)",
      "toolbar_vertical_separator": "rgb(224, 14, 14)",
      "tab_loading": "rgb(33, 153, 17)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{afd4586e-96e6-4fda-b120-b378b789e1e2}"
    }
  }
}