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Extensions 
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Dynatrace Real User Monitoring
This extension allows you to monitor (SaaS) applications where installation of Dynatrace OneAgent is not possible.
User-Agent Switcher and Manager
Spoof websites trying to gather information about your web navigation to deliver distinct content you may not want
Random User-Agent (Switcher)
Automatically change the user agent after specified period of time to a randomly selected one, thus hiding your real user agent
User Agent Switcher, URL sniffer
This extension can switch the user agent of a browser. and it allows you to find all HTTP URLs.
Loop11 User Testing
The Loop11 extension lets you participate in usability tests & is only active whilst completing a test for which you’ve opted in.
User-Agent Switcher
Change User-Agent Setting. Spoof it to the UA of Firefox, Android, Chromebook, Safari, Googlebot or a custom string.
Twitch Username and User ID Translator
Fetch user id of a Twitch username or the username of a Twitch user id.
Social Media Advanced Search - Find User Info
Find Additional Profile Info. Pulls profile_id from page puts it in a URL to find additional info about person
User Agent Switcher for Google Chrome™
Quickly and easily switch between popular user-agent strings.
ESCB-PKI user certificate enrollment
This extension enables the management of cryptographic devices (smartcards and/or tokens) for European System of Central Banks PKI…
Proxy & User-Agent Switcher
The Proxy & User-Agent Switcher extension helps to do geolocation-testing and mobile device-testing of any websites.
Http User-Agent Switcher
Http User-Agent Switcher extension adds a menu on web page and a toolbar button to switch between user-agents on Chrome.
User-Agent
User-Agent like never before! Set User-agent by domain, URL, wildcard, 'key'word, regex (or global). Keep Mobile page or desktop…
StackOverflow Power User
Stop wasting time while programming! Adds many features to save time when searching for solutions on StackOverflow
Random User Generator
Generate 1 to 10,000 users for filling databases and testing web API's in seconds without leaving the page
GitHub User Languages
See the language usage breakdown of a User or Org right on their GitHub profile page.
User Monitoring for webapp e.g.SalesForce.com
Inject Germain UX monitoring to enable Real User Monitoring for Web Application (e.g. Salesforce.com, eCommerce, Website, etc).