Examine source code of Ash

{
  "manifest_version": 3,
  "name": "Ash",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "nova-ash@mozilla.org",
      "strict_min_version": "153.0"
    }
  },
  "theme": {
    "colors": {
      "frame": [
        239,
        237,
        242
      ],
      "frame_inactive": [
        219,
        217,
        222
      ],
      "toolbar": [
        255,
        255,
        255
      ],
      "toolbar_text": [
        18,
        17,
        20
      ],
      "icons": [
        37,
        36,
        40
      ],
      "icons_attention": [
        148,
        146,
        151
      ],
      "toolbar_top_separator": [
        0,
        0,
        0,
        0
      ],
      "toolbar_bottom_separator": [
        214,
        213,
        218
      ],
      "toolbar_vertical_separator": [
        214,
        213,
        218
      ],
      "tab_selected": [
        255,
        255,
        255
      ],
      "tab_text": [
        18,
        17,
        20
      ],
      "tab_background_text": [
        18,
        17,
        20
      ],
      "tab_line": [
        183,
        182,
        186
      ],
      "tab_loading": [
        183,
        182,
        186
      ],
      "tab_background_separator": [
        0,
        0,
        0,
        0.16
      ],
      "toolbar_field": [
        255,
        255,
        255
      ],
      "toolbar_field_text": [
        18,
        17,
        20
      ],
      "toolbar_field_border": [
        0,
        0,
        0,
        0.14
      ],
      "toolbar_field_focus": [
        255,
        255,
        255
      ],
      "toolbar_field_text_focus": [
        18,
        17,
        20
      ],
      "toolbar_field_separator": [
        0,
        0,
        0,
        0.16
      ],
      "sidebar": [
        255,
        255,
        255
      ],
      "sidebar_text": [
        18,
        17,
        20
      ],
      "sidebar_border": [
        214,
        213,
        218
      ],
      "sidebar_highlight": [
        214,
        213,
        218
      ],
      "button_background_hover": [
        214,
        213,
        218
      ],
      "button_background_active": [
        183,
        182,
        186
      ],
      "ntp_background": [
        252,
        251,
        255
      ]
    },
    "images": {
      "additional_backgrounds": [
        {
          "linear-gradient": "90deg, #FCFBFF 0%, #EFEDF2 60%, #D6D5DA 100%"
        }
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ],
      "additional_backgrounds_size": [
        "auto"
      ]
    }
  },
  "dark_theme": {
    "colors": {
      "frame": [
        18,
        17,
        20
      ],
      "frame_inactive": [
        6,
        5,
        7
      ],
      "toolbar": [
        29,
        27,
        31
      ],
      "toolbar_text": [
        252,
        251,
        255
      ],
      "icons": [
        252,
        251,
        255
      ],
      "icons_attention": [
        183,
        182,
        186
      ],
      "toolbar_bottom_separator": [
        23,
        21,
        25
      ],
      "toolbar_vertical_separator": [
        23,
        21,
        25
      ],
      "tab_selected": [
        29,
        27,
        31
      ],
      "tab_text": [
        252,
        251,
        255
      ],
      "tab_background_text": [
        252,
        251,
        255
      ],
      "tab_line": [
        103,
        102,
        106
      ],
      "tab_loading": [
        103,
        102,
        106
      ],
      "toolbar_field": [
        29,
        27,
        31
      ],
      "toolbar_field_text": [
        252,
        251,
        255
      ],
      "toolbar_field_border": [
        63,
        62,
        66
      ],
      "toolbar_field_focus": [
        39,
        36,
        41
      ],
      "toolbar_field_text_focus": [
        252,
        251,
        255
      ],
      "sidebar": [
        29,
        27,
        31
      ],
      "sidebar_text": [
        252,
        251,
        255
      ],
      "sidebar_border": [
        23,
        21,
        25
      ],
      "sidebar_highlight": [
        81,
        80,
        84
      ],
      "button_background_hover": [
        81,
        80,
        84
      ],
      "button_background_active": [
        103,
        102,
        106
      ],
      "ntp_background": [
        18,
        17,
        20
      ]
    },
    "images": {
      "additional_backgrounds": [
        {
          "linear-gradient": "90deg, #3F3E42 0%, #252428 60%, #171519 100%"
        }
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ],
      "additional_backgrounds_size": [
        "auto"
      ]
    }
  }
}