Examine source code of Link Sanitizer

{
  "manifest_version": 2,
  "name": "Link Sanitizer",
  "description": "This extension removes tracking parameters from URLs (UTM,...)",
  "version": "1.0",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e109da5e-fa4e-4115-91e8-42659939df2c}"
    }
  }
}