Examine source code of Fire Grey Theme

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "cameronsimbulan@icloud.com"
    }
  },
  "name": "Fire Grey Theme",
  "description": "A dark theme with red accent for personal use",
  "author": "Cameron Simbulan",
  "version": "1.1",
  "theme": {
    "colors": {
      "icons": "rgb(249, 249, 250, 0.7)",
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(170, 170, 170, 1)",
      "tab_text": "rgba(255, 255, 255, 1)",
      "tab_line": "#d10028",
      "toolbar": "rgba(35, 35, 35, 1)",
      "bookmark_text": "rgba(170, 170, 170, 1)",
      "toolbar_top_separator": "rgba(35, 35, 35, 1)",
      "toolbar_bottom_separator": "rgba(35, 35, 35, 1)",
      "toolbar_vertical_separator": "rgba(35, 35, 35, 1)",
      "toolbar_field": "rgba(18, 18, 18, 1)",
      "toolbar_field_text": "rgba(200, 200, 200, 1)",
      "toolbar_field_focus": "rgba(18, 18, 18, 1)",
      "toolbar_field_border": "rgba(18, 18, 18, 1)",
      "toolbar_field_separator": "rgba(18, 18, 18, 0.2)",
      "toolbar_field_border_focus": "rgba(30, 30, 30, 1)",
      "button_background_hover": "rgba(255, 255, 255, 0.12)",
      "button_background_active": "rgba(255, 255, 255, 0.15)",
      "popup": "rgba(18, 18, 18, 1)",
      "popup_text": "rgba(200, 200, 200, 1)",
      "popup_border": "rgba(18, 18, 18, 1)",
      "popup_highlight": "#21252B",
      "popup_highlight_text": "rgba(255, 255, 255, 1)",
      "ntp_background": "rgba(18, 18, 18, 1)",
      "ntp_text": "rgba(136, 136, 136, 1)",
      "sidebar": "rgba(35, 35, 35, 1)",
      "sidebar_text": "rgba(170, 170, 170, 1)",
      "sidebar_border": "rgba(35, 35, 35, 1)",
      "sidebar_highlight": "#21252B",
      "sidebar_highlight_text": "rgba(170, 170, 170, 1)"
    }
  }
}