Examine source code of disinterest

{
  "manifest_version": 2,
  "name": "disinterest",
  "version": "0.3.0",
  "description": "Making websites that one bit less interesting.",
  "icons": {
    "512": "asset/icon.svg"
  },
  "background": {
    "scripts": [
      "script/disinterest.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "asset/icon.svg",
    "default_popup": "popup/index.html",
    "default_title": "disinterest"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bc2f4dcb-71b1-463f-b1df-d4cb3142de8a}"
    }
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "storage"
  ]
}