Examine source code of usage-tracker

{
  "manifest_version": 2,
  "description": "Example using eslint",
  "name": "eslint-example",
  "version": "1.1",
  "homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/eslint-example",
  "browser_action": {
    "default_icon": "icons/page-32.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "scoreboard.js"
      ]
    }
  ],
  "permissions": [
    "*://4mpgsamyqb.execute-api.us-east-1.amazonaws.com/*"
  ]
}