Examine source code of AccentKB

{
  "manifest_version": 2,
  "name": "AccentKB",
  "version": "0.2",
  "description": "Provides keyboard shortcuts for keyboard accents.",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.svg"
  }
}