Examine source code of Ref&Roll

{
  "manifest_version": 2,
  "name": "Ref&Roll",
  "version": "1.1.0",
  "description": "Ref&Roll automates the usage of referral links previously added to the extension",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0c1fb106-61f1-4e13-b5fc-573c93e29185}",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "48": "icons/refndroll_48.png",
    "96": "icons/refndroll_96.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "storage",
    "http://*/*",
    "https://*/*",
    "<all_urls>",
    "tabs"
  ],
  "background": {
    "scripts": [
      "content_scripts/redirect.js",
      "content_scripts/storeReferal.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/refndroll_48.png",
    "default_title": "Ref & Roll",
    "default_popup": "popup/pop_up.html"
  },
  "web_accessible_resources": []
}