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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Optimism",
  "theme": {
    "images": {
      "theme_frame": "images/frame.png",
      "theme_toolbar": "images/toolbar.png",
      "theme_tab_background": "images/tab_background.png",
      "theme_ntp_background": "images/ntp_background.png",
      "theme_frame_inactive": "images/frame_inactive.png",
      "theme_frame_incognito": "images/frame_incognito.png",
      "theme_frame_incognito_inactive": "images/frame_incognito_inactive.png",
      "theme_tab_background_incognito": "images/tab_background_incognito.png",
      "theme_tab_background_v": "images/tab_background_v.png",
      "theme_frame_overlay": "images/frame_overlay.png",
      "theme_frame_overlay_inactive": "images/frame_overlay_inactive.png",
      "theme_button_background": "images/button_background.png",
      "theme_ntp_attribution": "images/ntp_attribution.png"
    },
    "colors": {
      "theme_frame_inactive": [
        0,
        0,
        0
      ],
      "toolbar": [
        136,
        107,
        79
      ],
      "tab_text": [
        0,
        0,
        0
      ],
      "tab_background_text": [
        0,
        0,
        0
      ],
      "bookmark_text": [
        234,
        190,
        144
      ],
      "ntp_background": [
        0,
        0,
        0
      ],
      "ntp_text": [
        234,
        190,
        144
      ],
      "ntp_link": [
        6,
        55,
        116
      ],
      "ntp_link_underline": [
        6,
        55,
        116
      ],
      "ntp_header": [
        6,
        55,
        116
      ],
      "ntp_section": [
        87,
        59,
        20
      ],
      "ntp_section_text": [
        139,
        196,
        203
      ],
      "ntp_section_link": [
        6,
        55,
        116
      ],
      "ntp_section_link_underline": [
        6,
        55,
        116
      ],
      "button_background": [
        206,
        232,
        192
      ]
    },
    "tints": {
      "buttons": [
        0.3,
        0.5,
        0.5
      ],
      "frame": [
        0.3,
        0.5,
        0.5
      ],
      "frame_inactive": [
        0.3,
        0.5,
        0.5
      ],
      "frame_incognito": [
        0.3,
        0.5,
        0.5
      ],
      "frame_incognito_inactive": [
        0.3,
        0.5,
        0.5
      ],
      "background_tab": [
        0.3,
        0.5,
        0.5
      ]
    },
    "properties": {
      "ntp_background_alignment": "center",
      "ntp_background_repeat": "no-repeat",
      "ntp_logo_alternate": 0
    }
  },
  "version": "1.0"
}