Examine source code of Lass Theme

{
  "theme": {
    "images": {
      "theme_frame": "Lassthemeforfirefox.jpg"
    },
    "colors": {
      "frame": "#056cfc",
      "tab_background_text": "#2267f2"
    }
  },
  "version": "2.0",
  "name": "Lass Theme",
  "manifest_version": 2,
  "description": "Lass theme for Firefox\nCreated by Phoenix Webcheats"
}