Examine source code of Office365 Cookie Cleaner

{
  "manifest_version": 2,
  "name": "Office365 Cookie Cleaner",
  "version": "1.0",
  "description": "Clears cookies for Office365.com domains",
  "permissions": [
    "cookies",
    "tabs",
    "contextMenus",
    "notifications",
    "storage",
    "<all_urls>",
    "*://*.office365.com/*",
    "*://*.officeapps.live.com/*",
    "*://*.outlook.com/*",
    "*://*.outlook.live.com/*",
    "*://*.live.com/*",
    "*://*.microsoftonline.com/*",
    "*://*.login.microsoftonline.com/*",
    "*://*.office.com/*",
    "*://*.sharepoint.com/*",
    "*://*.onedrive.com/*",
    "*://office365.com/*",
    "*://officeapps.live.com/*",
    "*://outlook.com/*",
    "*://outlook.live.com/*",
    "*://live.com/*",
    "*://microsoftonline.com/*",
    "*://login.microsoftonline.com/*",
    "*://office.com/*",
    "*://sharepoint.com/*",
    "*://onedrive.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Clear Office365 Cookies",
    "default_icon": {
      "16": "icon-16.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5006d1c9-0a60-4ea1-bc3e-d56cc22b1b02}"
    }
  }
}