Examine source code of Mossy green

{
  "manifest_version": 2,
  "name": "Moss",
  "version": "1.1",
  "theme": {
    "colors": {
      "bookmark_text": "hsla(0, 0%, 100%, 1)",
      "frame": "hsla(138, 16%, 30%, 1)",
      "frame_inactive": "hsla(138, 16%, 30%, 1)",
      "icons": "hsla(0, 0%, 100%, 1)",
      "icons_attention": "hsla(146, 44%, 86%, 1)",
      "ntp_background": "hsla(140, 2%, 20%, 1)",
      "ntp_card_background": "hsla(138, 2%, 28%, 1)",
      "ntp_text": "hsla(0, 0%, 100%, 1)",
      "popup": "hsla(138, 2%, 28%, 1)",
      "popup_border": "hsla(138, 8%, 48%, 1)",
      "popup_highlight": "hsla(138, 18%, 50%, 0.42)",
      "popup_highlight_text": "hsla(0, 0%, 100%, 1)",
      "popup_text": "hsla(0, 0%, 100%, 1)",
      "sidebar": "hsla(138, 2%, 28%, 1)",
      "sidebar_highlight": "hsla(138, 18%, 50%, 0.42)",
      "sidebar_highlight_text": "hsla(0, 0%, 100%, 1)",
      "sidebar_text": "hsla(0, 0%, 100%, 1)",
      "tab_background_text": "hsla(0, 0%, 100%, 1)",
      "tab_line": "hsla(138, 8%, 48%, 1)",
      "tab_loading": "hsla(146, 44%, 86%, 1)",
      "tab_loading_inactive": "hsla(146, 44%, 86%, 1)",
      "tab_selected": "hsla(138, 2%, 28%, 1)",
      "tab_text": "hsla(0, 0%, 100%, 1)",
      "toolbar": "hsla(138, 15%, 42%, 1)",
      "toolbar_bottom_separator": "hsla(138, 16%, 30%, 1)",
      "toolbar_field": "hsla(138, 16%, 30%, 1)",
      "toolbar_field_border": "hsla(138, 8%, 48%, 1)",
      "toolbar_field_focus": "hsla(138, 2%, 28%, 1)",
      "toolbar_field_text": "hsla(0, 0%, 100%, 1)",
      "toolbar_text": "hsla(0, 0%, 100%, 1)",
      "toolbar_field_text_focus": "hsla(0, 0%, 100%, 1)",
      "toolbar_field_highlight_text": "hsla(0, 0%, 100%, 1)",
      "toolbar_top_separator": "hsla(138, 8%, 48%, 1)",
      "panel_separator": "hsla(138, 8%, 48%, 1)"
    },
    "properties": {
      "color_scheme": "dark",
      "content_color_scheme": "dark"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f9261f02-c03c-4352-92ee-78dd8b41ca98}"
    }
  }
}