Examine source code of Ezproxy Switcher

{
  "manifest_version": 2,
  "name": "Ezproxy Switcher",
  "version": "1.0.2",
  "description": "To access academic papers on some sites, one is required going through his/her institute's ezproxy. First fill in the ezproxy address in Options. Then click the icon in the address bar to quickly switch between ezproxied URL and non-ezproxied URL.",
  "applications": {
    "gecko": {
      "id": "{3936e809-c528-46ef-8b47-e6a7eed6d746}"
    }
  },
  "icons": {
    "48": "icons/logo.png"
  },
  "page_action": {
    "browser_style": true,
    "default_icon": "icons/logo.png",
    "default_title": "Ezproxy Quick Switcher",
    "show_matches": [
      "<all_urls>"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/logo.png",
    "default_title": "Ezproxy Go"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}