Examine source code of Vanir

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Skogkatt",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(206, 206, 206)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(255, 255, 255, 0.15)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(34, 34, 34, 0.92)",
      "popup_text": "rgba(248, 248, 244, 0.78)",
      "button_background_active": "rgba(108, 108, 108, 0)",
      "button_background_hover": "rgba(94, 94, 94, 0)",
      "frame_inactive": "rgba(108, 108, 108, 0)",
      "icons_attention": "rgba(58, 58, 58, 0.81)",
      "icons": "rgb(108, 108, 108)",
      "ntp_background": "rgba(94, 94, 94, 0)",
      "ntp_text": "rgba(217, 217, 217, 0)",
      "popup_border": "rgba(94, 94, 94, 0)",
      "popup_highlight_text": "rgba(94, 94, 94, 0)",
      "popup_highlight": "rgba(94, 94, 94, 0)",
      "sidebar_border": "rgba(94, 94, 94, 0)",
      "sidebar_highlight_text": "rgba(94, 94, 94, 0)",
      "sidebar_highlight": "rgb(108, 108, 108)",
      "sidebar_text": "rgba(94, 94, 94, 0)",
      "tab_background_separator": "rgba(94, 94, 94, 0)",
      "tab_loading": "rgb(108, 108, 108)",
      "tab_selected": "rgba(94, 94, 94, 0)",
      "toolbar_bottom_separator": "rgba(94, 94, 94, 0)",
      "toolbar_field_border_focus": "rgba(94, 94, 94, 0)",
      "toolbar_field_focus": "rgba(94, 94, 94, 0)",
      "toolbar_field_highlight_text": "rgba(94, 94, 94, 0)",
      "toolbar_field_separator": "rgba(94, 94, 94, 0)",
      "toolbar_field_text_focus": "rgba(255, 255, 255, 0.7)",
      "toolbar_top_separator": "rgba(94, 94, 94, 0)",
      "toolbar_vertical_separator": "rgba(255, 255, 255, 0.72)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d077fb76-1acd-4e17-864c-344d0093d32b}"
    }
  }
}