Examine source code of bionic-reading

{
  "description": "Bionic reading",
  "manifest_version": 2,
  "name": "bionic-reading",
  "version": "1.0",
  "homepage_url": "https://github.com/vsecoder/bionic-reading",
  "icons": {
    "64": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff3d808c-39c2-4b84-82bc-8f7590fede6f}"
    }
  }
}