Examine source code of Activist Bold

{
  "manifest_version": 2,
  "name": "Activist – Bold",
  "author": "Mozilla",
  "version": "1.1.3",
  "icons": {
    "32": "icon.svg"
  },
  "theme": {
    "colors": {
      "tab_background_text": "hsl(0, 0%, 100%)",
      "tab_text": "hsl(0, 0%, 100%)",
      "tab_selected": "hsl(220, 79%, 11%)",
      "tab_line": "hsl(220, 54%, 67%)",
      "tab_loading": "hsl(220, 70%, 78%)",
      "tab_loading_inactive": "hsl(220, 70%, 78%)",
      "frame": "hsl(233, 73%, 12%)",
      "popup": "hsl(220, 79%, 11%)",
      "popup_text": "hsl(0, 0%, 100%)",
      "popup_border": "hsl(220, 69%, 66%)",
      "popup_highlight": "hsla(220, 89%, 69%, 0.2)",
      "popup_highlight_text": "hsl(0, 0%, 100%)",
      "toolbar": "hsl(234, 90%, 19%)",
      "toolbar_text": "hsl(0, 0%, 100%)",
      "toolbar_field": "hsl(233, 73%, 12%)",
      "toolbar_field_text": "hsl(0, 0%, 100%)",
      "toolbar_field_focus": "hsl(220, 79%, 11%)",
      "toolbar_field_border_focus": "rgba(0, 221, 255, 0.7)",
      "toolbar_top_separator": "transparent",
      "toolbar_bottom_separator": "hsl(233, 73%, 12%)",
      "ntp_background": "hsl(222, 100%, 3%)",
      "ntp_card_background": "hsl(220, 79%, 11%)",
      "ntp_text": "hsl(0, 0%, 100%)",
      "sidebar": "hsl(220, 79%, 11%)",
      "sidebar_text": "hsl(0, 0%, 100%)",
      "sidebar_highlight": "hsla(220, 89%, 69%, 0.2)",
      "address_bar_box": "hsl(220, 79%, 11%)",
      "address_bar_box_active": "hsla(220, 79%, 11%, 0.65)",
      "address_bar_box_focus": "hsl(234, 90%, 19%)",
      "address_bar_box_text": "hsl(0, 0%, 100%)",
      "address_bar_url_color": "hsl(219, 37%, 59%)",
      "panel_item_hover": "hsla(220, 89%, 69%, 0.2)",
      "panel_item_active": "hsla(220, 89%, 69%, 0.35)",
      "panel_separator": "hsl(220, 69%, 66%)",
      "icons_attention": "hsl(220, 70%, 78%)",
      "toolbar_field_icons_attention": "hsl(220, 70%, 78%)",
      "tab_attention_dot": "hsl(94, 100%, 71%)",
      "appmenu_update_icon_color": "hsl(94, 100%, 71%)",
      "appmenu_info_icon_color": "hsl(173, 100%, 71%)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc8a7745-56fb-41bd-b2f9-aea8bbe693cd}"
    }
  }
}