grayscale values Firefox

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manifest.json
{
  "manifest_version": 2,
  "version": "1.0",
  "name": "grayscale values",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(127, 127, 127)",
      "toolbar_text": "rgb(57, 57, 57)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(102, 102, 102)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(102, 102, 102)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(57, 57, 57)",
      "button_background_hover": "rgb(102, 102, 102)",
      "frame_inactive": "rgb(0, 0, 0)",
      "icons_attention": "rgb(0, 0, 0)",
      "icons": "rgb(255, 255, 255)",
      "popup_border": "rgb(102, 102, 102)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(57, 57, 57)",
      "tab_selected": "rgb(127, 127, 127)",
      "toolbar_bottom_separator": "rgb(127, 127, 127)",
      "toolbar_field_border_focus": "rgb(57, 57, 57)",
      "toolbar_field_border": "rgb(102, 102, 102)",
      "toolbar_field_focus": "rgb(57, 57, 57)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(102, 102, 102)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(127, 127, 127)",
      "toolbar_vertical_separator": "rgb(102, 102, 102)"
    }
  }
}

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