piwik-checker/manifest.json

{
  "manifest_version": 2,
  "name": "Piwik Checker",
  "description": "Description",
  "version": "0.1",
  "devtools_page": "devtools.html",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}