Examine source code of sbondPixels

{
  "manifest_version": 2,
  "name": "sbondPixels",
  "short_name": "sbPx",
  "version": "1.1",
  "description": "Shows the current resolution of the window.",
  "applications": {
    "gecko": {
      "id": "pixels@sbond.co"
    }
  },
  "icons": {
    "24": "icons/icon.svg",
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "sbondPixels"
  },
  "background": {
    "scripts": [
      "js/state.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/main.js"
      ]
    }
  ]
}