Examine source code of Vague Theme for Firefox

{
  "manifest_version": 3,
  "name": "Vague Theme for Firefox",
  "description": "A cool, dark, low contrast theme for Firefox. Pastel yet vivid, like a fleeting memory...",
  "version": "1.0",
  "theme": {
    "properties": {
      "color_scheme": "dark"
    },
    "colors": {
      "frame": "#141415",
      "frame_inactive": "#141415",
      "tab_background_text": "#c3c3d5",
      "tab_selected_background": "#252530",
      "tab_selected_text": "#cdcdcd",
      "tab_line": "#252530",
      "tab_loading": "#aeaed1",
      "toolbar": "#252530",
      "toolbar_text": "#cdcdcd",
      "toolbar_field": "#141415",
      "toolbar_field_text": "#cdcdcd",
      "toolbar_field_border": "#141415",
      "toolbar_field_focus": "#141415",
      "toolbar_field_text_focus": "#cdcdcd",
      "toolbar_field_border_focus": "#aeaed1",
      "toolbar_field_highlight": "#7e98e8",
      "toolbar_field_highlight_text": "#141415",
      "toolbar_top_separator": "#141415",
      "toolbar_bottom_separator": "#141415",
      "toolbar_vertical_separator": "#252530",
      "icons": "#cdcdcd",
      "icons_attention": "#aeaed1",
      "button_background_hover": "#333738",
      "button_background_active": "#333738",
      "popup": "#252530",
      "popup_text": "#cdcdcd",
      "popup_border": "#333738",
      "popup_highlight": "#2e2e3c",
      "popup_highlight_text": "#cdcdcd",
      "sidebar": "#141415",
      "sidebar_text": "#cdcdcd",
      "sidebar_highlight": "#252530",
      "sidebar_highlight_text": "#cdcdcd",
      "sidebar_border": "#252530",
      "ntp_background": "#141415",
      "ntp_text": "#cdcdcd"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3f8c2d1-7e4b-4f9a-b2c3-d4e5f6a7b8c9}"
    }
  }
}