Examine source code of Dark theme for Proton

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark tab fix for Proton",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(43, 42, 51)",
      "toolbar_text": "rgb(251, 251, 254)",
      "frame": "rgb(28, 27, 34)",
      "tab_background_text": "rgb(162, 162, 166)",
      "toolbar_field": "rgb(28, 27, 34)",
      "toolbar_field_text": "rgb(251, 251, 254)",
      "tab_line": "rgba(43, 42, 51, 0)",
      "popup": "rgb(28, 27, 34)",
      "popup_text": "rgb(251, 251, 254)",
      "sidebar_border": "rgb(43, 42, 51)",
      "sidebar_text": "rgb(251, 251, 254)",
      "sidebar": "rgb(43, 42, 51)",
      "tab_selected": "rgb(162, 162, 166)",
      "tab_text": "rgb(28, 27, 34)",
      "toolbar_field_border_focus": "rgb(0, 184, 255)",
      "toolbar_top_separator": "rgb(43, 42, 51)",
      "tab_loading": "rgba(43, 42, 51, 0)"
    }
  }
}