Examine source code of Pine

{
  "manifest_version": 3,
  "name": "Pine",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "nova-pine@mozilla.org",
      "strict_min_version": "153.0"
    }
  },
  "theme": {
    "colors": {
      "frame": [
        236,
        244,
        241
      ],
      "frame_inactive": [
        216,
        224,
        221
      ],
      "toolbar": [
        255,
        255,
        255
      ],
      "toolbar_text": [
        0,
        30,
        18
      ],
      "icons": [
        0,
        73,
        51
      ],
      "icons_attention": [
        17,
        174,
        132
      ],
      "toolbar_top_separator": [
        0,
        0,
        0,
        0
      ],
      "toolbar_bottom_separator": [
        144,
        227,
        198
      ],
      "toolbar_vertical_separator": [
        144,
        227,
        198
      ],
      "tab_selected": [
        255,
        255,
        255
      ],
      "tab_text": [
        0,
        30,
        18
      ],
      "tab_background_text": [
        0,
        30,
        18
      ],
      "tab_line": [
        74,
        204,
        166
      ],
      "tab_loading": [
        74,
        204,
        166
      ],
      "tab_background_separator": [
        0,
        0,
        0,
        0.16
      ],
      "toolbar_field": [
        255,
        255,
        255
      ],
      "toolbar_field_text": [
        0,
        30,
        18
      ],
      "toolbar_field_border": [
        0,
        0,
        0,
        0.14
      ],
      "toolbar_field_focus": [
        255,
        255,
        255
      ],
      "toolbar_field_text_focus": [
        0,
        30,
        18
      ],
      "toolbar_field_separator": [
        0,
        0,
        0,
        0.16
      ],
      "sidebar": [
        255,
        255,
        255
      ],
      "sidebar_text": [
        0,
        30,
        18
      ],
      "sidebar_border": [
        144,
        227,
        198
      ],
      "sidebar_highlight": [
        196,
        241,
        224
      ],
      "button_background_hover": [
        196,
        241,
        224
      ],
      "button_background_active": [
        144,
        227,
        198
      ],
      "ntp_background": [
        236,
        244,
        241
      ]
    },
    "images": {
      "additional_backgrounds": [
        {
          "linear-gradient": "135deg, #ECF4F1 0%, #C4F1E0 60%, #90E3C6 100%"
        }
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ],
      "additional_backgrounds_size": [
        "auto"
      ]
    }
  },
  "dark_theme": {
    "colors": {
      "frame": [
        0,
        30,
        18
      ],
      "frame_inactive": [
        0,
        16,
        6
      ],
      "toolbar": [
        29,
        27,
        31
      ],
      "toolbar_text": [
        236,
        244,
        241
      ],
      "icons": [
        236,
        244,
        241
      ],
      "icons_attention": [
        144,
        227,
        198
      ],
      "toolbar_bottom_separator": [
        0,
        48,
        32
      ],
      "toolbar_vertical_separator": [
        0,
        48,
        32
      ],
      "tab_selected": [
        29,
        27,
        31
      ],
      "tab_text": [
        236,
        244,
        241
      ],
      "tab_background_text": [
        236,
        244,
        241
      ],
      "tab_line": [
        6,
        103,
        75
      ],
      "tab_loading": [
        6,
        103,
        75
      ],
      "toolbar_field": [
        29,
        27,
        31
      ],
      "toolbar_field_text": [
        236,
        244,
        241
      ],
      "toolbar_field_border": [
        63,
        62,
        66
      ],
      "toolbar_field_focus": [
        39,
        36,
        41
      ],
      "toolbar_field_text_focus": [
        236,
        244,
        241
      ],
      "sidebar": [
        29,
        27,
        31
      ],
      "sidebar_text": [
        236,
        244,
        241
      ],
      "sidebar_border": [
        0,
        48,
        32
      ],
      "sidebar_highlight": [
        6,
        103,
        75
      ],
      "button_background_hover": [
        6,
        103,
        75
      ],
      "button_background_active": [
        0,
        136,
        101
      ],
      "ntp_background": [
        0,
        30,
        18
      ]
    },
    "images": {
      "additional_backgrounds": [
        {
          "linear-gradient": "135deg, #004933 0%, #003020 60%, #001E12 100%"
        }
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ],
      "additional_backgrounds_size": [
        "auto"
      ]
    }
  }
}