Examine source code of Cheer up!

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cheer up!",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(165, 19, 235)",
      "toolbar_text": "rgb(236, 140, 28)",
      "frame": "rgb(111, 223, 202)",
      "tab_background_text": "rgb(113, 4, 165)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(12, 22, 236)",
      "tab_line": "rgb(225, 35, 74)",
      "popup": "rgb(241, 243, 184)",
      "popup_text": "rgb(29, 37, 230)",
      "button_background_active": "rgb(241, 243, 184)",
      "button_background_hover": "rgb(132, 210, 247)",
      "frame_inactive": "rgb(214, 184, 243)",
      "icons_attention": "rgb(197, 247, 132)",
      "icons": "rgb(245, 232, 22)",
      "ntp_background": "rgb(139, 222, 236)",
      "ntp_text": "rgb(12, 22, 236)",
      "popup_border": "rgb(231, 247, 132)",
      "popup_highlight_text": "rgb(113, 4, 165)",
      "popup_highlight": "rgb(212, 243, 18)",
      "sidebar_border": "rgb(188, 197, 243)",
      "sidebar_highlight_text": "rgb(235, 104, 136)",
      "sidebar_highlight": "rgb(243, 188, 237)",
      "sidebar_text": "rgb(104, 118, 235)",
      "sidebar": "rgb(245, 214, 235)",
      "tab_background_separator": "rgb(150, 241, 196)",
      "tab_loading": "rgb(153, 218, 249)",
      "tab_selected": "rgb(241, 64, 108)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(65, 188, 127)",
      "toolbar_field_border_focus": "rgb(134, 235, 167)",
      "toolbar_field_border": "rgb(34, 190, 226)",
      "toolbar_field_focus": "rgb(232, 194, 234)",
      "toolbar_field_highlight_text": "rgb(113, 4, 165)",
      "toolbar_field_highlight": "rgb(235, 161, 134)",
      "toolbar_field_separator": "rgb(243, 228, 127)",
      "toolbar_field_text_focus": "rgb(12, 22, 236)",
      "toolbar_top_separator": "rgb(67, 231, 218)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{65fd3cd5-0776-40e8-97c8-5d2defd7a9b0}"
    }
  }
}