Examine source code of s i l e n c e

{
  "theme": {
    "images": {
      "theme_frame": "silence.png"
    },
    "colors": {
      "frame": "#38852c",
      "tab_background_text": "#f2faf2"
    }
  },
  "version": "2.0",
  "name": "s i l e n c e",
  "manifest_version": 2,
  "description": "silence!"
}