Examine source code of Save yourself from irrelevant websites

{
  "theme": {
    "images": {
      "theme_frame": "tip_persona01.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Save yourself from irrelevant websites",
  "manifest_version": 2,
  "description": "I often get distracted by stupid things on the net that have nothing to do with whatever I needed to find in the first place. They wasted precious time that could otherwise have been spent with friends, in a pub or outside in a park in the sun. So I thought Id create something that would help minimise my mindless searches and help me remember life is for the living. Hopefully it helps you too."
}