Examine source code of Just a Red Theme

{
  "manifest_version": 2,
  "version": "2.0.2.1",
  "name": "Just a Red Theme",
  "description": "A red theme. Just a very red theme.",
  "author": "egfilin",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-037-b73f9b34467ba541de861f5b4c0c6316.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(200, 18, 18)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(165, 21, 21)",
      "tab_background_text": "rgb(210, 209, 206)",
      "toolbar_field": "rgb(200, 18, 18)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(200, 18, 18)",
      "popup": "rgb(200, 21, 21)",
      "popup_text": "rgb(255, 255, 255)",
      "frame_inactive": "rgb(124, 12, 12)",
      "button_background_hover": "rgba(210, 209, 206, 0.4)",
      "button_background_active": "rgb(224, 52, 52)",
      "ntp_background": "rgb(200, 21, 21)",
      "ntp_text": "rgb(255, 255, 255)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgba(210, 209, 206, 0.4)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(200, 18, 18)",
      "sidebar_border": "rgb(200, 18, 18)",
      "tab_selected": "rgba(229, 26, 8, 0)",
      "tab_background_separator": "rgba(200, 18, 18, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border_focus": "rgb(200, 21, 21)",
      "toolbar_field_border": "rgb(200, 18, 18)",
      "toolbar_bottom_separator": "rgb(200, 18, 18)",
      "toolbar_field_focus": "rgb(165,21,21)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgba(210, 209, 206, 0.4)",
      "toolbar_field_separator": "rgb(200, 21, 21)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(200, 21, 21)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "justred@egfilin.theme",
      "strict_min_version": "68.0"
    }
  }
}