Examine source code of decolour

{
  "manifest_version": 2,
  "name": "decolour",
  "version": "0.1",
  "description": "decolor your world!",
  "icons": {
    "48": "decolour.svg",
    "96": "decolour.svg"
  },
  "browser_action": {
    "default_icon": "decolour.svg",
    "default_title": "deColour your world!"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "decolour.js"
      ]
    }
  ]
}