Examine source code of YoloPastel

{
  "description": "Pastel Theme",
  "manifest_version": 2,
  "name": "Pastel",
  "version": "2.0",
  "homepage_url": "https://addons.mozilla.org/en-US/firefox/addon/yolopastel/",
  "theme": {
    "colors": {
      "button_background_hover": "#303030",
      "icons": "#d65d0e",
      "icons_attention": "#d65d0e",
      "popup": "#1d2021",
      "popup_text": "#fe8019",
      "popup_border": "#d65d0e",
      "popup_highlight": "#fe8019",
      "popup_highlight_text": "#282828",
      "tab_background_separator": "#282828",
      "tab_line": "#282828",
      "tab_loading": "#282828",
      "tab_selected": "#665c54",
      "tab_text": "#ebdbb2",
      "toolbar": "#665c54",
      "toolbar_bottom_separator": "#282828",
      "toolbar_field": "#282828",
      "toolbar_field_border": "#282828",
      "toolbar_field_border_focus": "#282828",
      "toolbar_field_focus": "#282828",
      "toolbar_field_separator": "#282828",
      "toolbar_field_text": "#d65d0e",
      "toolbar_field_text_focus": "#fe8019",
      "toolbar_top_separator": "#282828",
      "toolbar_vertical_separator": "#282828",
      "sidebar": "#282828",
      "sidebar_text": "#fe8019",
      "sidebar_highlight": "#fe8019",
      "sidebar_highlight_text": "#282828",
      "sidebar_border": "#fe8019",
      "frame": "#32302f",
      "tab_background_text": "#fbf1c7",
      "bookmark_text": "#fe8019"
    }
  }
}