Examine source code of WhatsUuupp Theme

{
  "manifest_version": 2,
  "name": "WhatsUuupp Header Theme",
  "version": "1.2",
  "description": "A simple colour theme inspired by Whatsapp.",
  "browser_specific_settings": {
    "gecko": {
      "id": "whatsUuuupp-theme@installsh.protonme",
      "strict_min_version": "91.0"
    }
  },
  "theme": {
    "colors": {
      "frame": "#25D366",
      "frame_inactive": "#128C7E",
      "tab_background_text": "#000000",
      "tab_selected": "#000000",
      "tab_text": "#FFFFFF",
      "tab_loading": "#FFFFFF",
      "tab_line": "#FFFFFF",
      "toolbar": "#25D366",
      "toolbar_text": "#5A5A5A",
      "toolbar_top_separator": "#000000",
      "toolbar_bottom_separator": "#000000",
      "toolbar_vertical_separator": "#000000",
      "toolbar_field": "#FCF5EB",
      "toolbar_field_text": "#000000",
      "toolbar_field_border": "#000000",
      "toolbar_field_focus": "#000000",
      "toolbar_field_text_focus": "#FFFFFF",
      "toolbar_field_border_focus": "#FFFFFF",
      "toolbar_field_highlight": "#25D366",
      "toolbar_field_highlight_text": "#000000",
      "icons": "#FFFFFF",
      "icons_attention": "#D5572B",
      "button_background_hover": "#000000",
      "button_background_active": "#0B5D1D",
      "popup": "#FCF5EB",
      "popup_text": "#000000",
      "popup_border": "#25D366",
      "popup_highlight": "#000000",
      "popup_highlight_text": "#FFFFFF",
      "sidebar": "#25D366",
      "sidebar_text": "#FFFFFF",
      "sidebar_border": "#25D366",
      "sidebar_highlight": "#000000",
      "sidebar_highlight_text": "#FFFFFF",
      "ntp_background": "#FCF5EB",
      "ntp_text": "#000000",
      "ntp_card_background": "#FFFFFF"
    }
  }
}