Examine source code of Linkly

{
  "name": "Linkly",
  "version": "1.2",
  "description": "Making any link a tracking link",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_title": "Create Linkly Link",
    "default_icon": "icon16.png"
  },
  "externally_connectable": {
    "matches": [
      "https://*.linklyhq.com/*"
    ]
  }
}