Examine source code of Lummas

{
  "theme": {
    "images": {
      "theme_frame": "firefox_top_lummas.png"
    },
    "colors": {
      "frame": "#fc0000",
      "tab_background_text": "#b2b7d9"
    }
  },
  "version": "2.0",
  "name": "Lummas",
  "manifest_version": 2,
  "description": "Hlavička s logom Lummas s.r.o."
}