Examine source code of Latitude Reading Room

{
  "manifest_version": 2,
  "name": "Latitude Reading Room",
  "version": "1.0",
  "description": "A calm visual environment inspired by shared reading rooms and northern latitudes. Cool hues and steady contrast support attentive reading without visual distraction.",
  "theme": {
    "colors": {
      "frame": "#1e252b",
      "tab_background_text": "#e4e7ea",
      "toolbar": "#283038",
      "toolbar_text": "#e4e7ea",
      "toolbar_field": "#f0f2f4",
      "toolbar_field_text": "#1e252b",
      "tab_line": "#6f8796"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0a89d21e-c45b-462b-b50a-02b9f50df2f2}"
    }
  }
}