Examine source code of PmSilver

{
  "theme": {
    "images": {
      "theme_frame": "personas_firefoxheader.jpg"
    },
    "colors": {
      "frame": "#4beb2f",
      "tab_background_text": "#0f4796"
    }
  },
  "version": "2.0",
  "name": "PmSilver",
  "manifest_version": 2,
  "description": "PmSilverPersonas Creation"
}