Examine source code of Minimalist Lines

{
  "name": "Minimalist Lines",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "topography.png"
    },
    "colors": {
      "frame": "rgba(240, 240, 240, 1)",
      "tab_background_text": "rgba(0, 0, 0, 0.5)",
      "toolbar_field_text": "rgba(0, 0, 0, 0.5)",
      "tab_line": "rgba(255, 255, 255, 0.25)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ea3ea171-3bfa-4a9e-8728-93d31d1f0dec}"
    }
  }
}