Examine source code of Halcyon Share

{
  "manifest_version": 2,
  "name": "Halcyon Share",
  "version": "1.1",
  "description": "Replaces all Twitter share buttons with Halcyon share buttons.",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://platform.twitter.com/widgets/*"
      ],
      "js": [
        "share.js"
      ],
      "all_frames": true
    }
  ],
  "options_ui": {
    "browser_style": false,
    "open_in_tab": true,
    "page": "settings.html"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "share@halcyon.social"
    }
  },
  "web_accessible_resources": [
    "settings.html"
  ]
}