Examine source code of Smoke

{
  "manifest_version": 3,
  "name": "Smoke",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "nova-smoke@mozilla.org",
      "strict_min_version": "153.0"
    }
  },
  "theme": {
    "colors": {
      "frame": [
        251,
        244,
        238
      ],
      "frame_inactive": [
        231,
        224,
        218
      ],
      "toolbar": [
        255,
        255,
        255
      ],
      "toolbar_text": [
        24,
        19,
        16
      ],
      "icons": [
        47,
        41,
        38
      ],
      "icons_attention": [
        112,
        105,
        100
      ],
      "toolbar_top_separator": [
        0,
        0,
        0,
        0
      ],
      "toolbar_bottom_separator": [
        227,
        226,
        231
      ],
      "toolbar_vertical_separator": [
        227,
        226,
        231
      ],
      "tab_selected": [
        255,
        255,
        255
      ],
      "tab_text": [
        24,
        19,
        16
      ],
      "tab_background_text": [
        24,
        19,
        16
      ],
      "tab_line": [
        189,
        182,
        177
      ],
      "tab_loading": [
        189,
        182,
        177
      ],
      "tab_background_separator": [
        0,
        0,
        0,
        0.16
      ],
      "toolbar_field": [
        255,
        255,
        255
      ],
      "toolbar_field_text": [
        24,
        19,
        16
      ],
      "toolbar_field_border": [
        0,
        0,
        0,
        0.14
      ],
      "toolbar_field_focus": [
        255,
        255,
        255
      ],
      "toolbar_field_text_focus": [
        24,
        19,
        16
      ],
      "toolbar_field_separator": [
        0,
        0,
        0,
        0.16
      ],
      "sidebar": [
        255,
        255,
        255
      ],
      "sidebar_text": [
        24,
        19,
        16
      ],
      "sidebar_border": [
        227,
        226,
        231
      ],
      "sidebar_highlight": [
        227,
        219,
        215
      ],
      "button_background_hover": [
        227,
        219,
        215
      ],
      "button_background_active": [
        189,
        182,
        177
      ],
      "ntp_background": [
        255,
        249,
        246
      ]
    },
    "images": {
      "additional_backgrounds": [
        {
          "linear-gradient": "135deg, #FFF9F6 0%, #FBF4EE 60%, #E3DBD7 100%"
        }
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ],
      "additional_backgrounds_size": [
        "auto"
      ]
    }
  },
  "dark_theme": {
    "colors": {
      "frame": [
        24,
        19,
        16
      ],
      "frame_inactive": [
        11,
        7,
        5
      ],
      "toolbar": [
        29,
        27,
        31
      ],
      "toolbar_text": [
        255,
        249,
        246
      ],
      "icons": [
        255,
        249,
        246
      ],
      "icons_attention": [
        245,
        237,
        232
      ],
      "toolbar_bottom_separator": [
        32,
        27,
        24
      ],
      "toolbar_vertical_separator": [
        32,
        27,
        24
      ],
      "tab_selected": [
        29,
        27,
        31
      ],
      "tab_text": [
        255,
        249,
        246
      ],
      "tab_background_text": [
        255,
        249,
        246
      ],
      "tab_line": [
        89,
        82,
        79
      ],
      "tab_loading": [
        89,
        82,
        79
      ],
      "toolbar_field": [
        29,
        27,
        31
      ],
      "toolbar_field_text": [
        255,
        249,
        246
      ],
      "toolbar_field_border": [
        63,
        62,
        66
      ],
      "toolbar_field_focus": [
        39,
        36,
        41
      ],
      "toolbar_field_text_focus": [
        255,
        249,
        246
      ],
      "sidebar": [
        29,
        27,
        31
      ],
      "sidebar_text": [
        255,
        249,
        246
      ],
      "sidebar_border": [
        32,
        27,
        24
      ],
      "sidebar_highlight": [
        89,
        82,
        79
      ],
      "button_background_hover": [
        89,
        82,
        79
      ],
      "button_background_active": [
        138,
        131,
        126
      ],
      "ntp_background": [
        24,
        19,
        16
      ]
    },
    "images": {
      "additional_backgrounds": [
        {
          "linear-gradient": "135deg, #3B3532 0%, #2F2926 60%, #201B18 100%"
        }
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ],
      "additional_backgrounds_size": [
        "auto"
      ]
    }
  }
}