It used to work very well, but recently it didn't work, I was frustrated, I didn't know why, I tried whitelist and blacklist mode, it didn't work, I was using the latest version of firefox, not sure if it was a compatibility issue with the latest version

It works, but apparently, it completely breaks Cloudflare's verification captcha system, so I can't use it.

Whitelist and blacklist modes are confusing, because the user can't see what agent strings are related (used or not used) to these modes.
Custom mode is not user friendly.
However it seems to be doing the job well... if you ever can figure out how to do it...

Bizarrely over complicated. The ntninja switcher let's you just pick a user agent and go. Never got this one to work.

A User-Agent Switcher that is reliable, but comes with a significant flaw. Unfortunately, I have not found a way to make any Cloudflare CAPTCHA work, which will simply refresh the site and loop the CAPTCHA. When this issue is resolved, I will turn this extension back on, but for now, it is causing more issues than it helps.

When i using whitelist mode, this add-ons sometimes mistakely chages my UA for site not on the list. This happens occasionally and triggers Google's security check which warns me that there might be suspicious / mailious behavior in my PC. (i gauess reason would be they find me using different browsers with same cookie in a short time) I confirmed that both fake UA and real UA appear in the Gmail's "recent activity" within short minutes. Oh, this problem is already reported by someone to the github repo: https://github.com/ray-lothian/UserAgent-Switcher/issues/191

Very good options and user-agents to choose from but unfortunately it doesn't work as well as the other User-Agent Switcher as some site still detect the old user agent strangely.

It breaks cloudflare challenge. You have to blacklist every site that uses cloudflare to avoid this issue

It works. It works well BUT it floods ADs, some precede videos in sites - bombarded with useless, bogus ads - SHOVING them. As much as I like being able to easily present a browser change, the issue still remains.

Works great after hours (lierally more than an hour) figuring out how to change the UA string for only ONE domain. Not intuitive. Not well enough explained and the GUI could be easier for the user. But it does work once I dug deep enough.

While I like the extension it needs to be updated more often. Either that or post a user agent config file that users can use to update the user agents as needed. Right now it is a year behind. It recently got updated for Google Chrome so I hope to see it here soon. If so you will get a full 5 stars. Thanks.

The per-site auto switch ability is important, and this is the only add-on I could find that does this reliably.

However, it fails leader ru's advanced privacy check... it detects an altered user agent. That's not good.

Unfortunately does not work on OpenSUSE Tumbleweed when watching Amazon Prime. Replacing the header was meant to allow HD viewing, but it seems Amazon sees through this ruse.

Generally, great to see folks out there trying to help us who prefer Linux based systems. We are so often ignored by streaming sites.

No global user-agent setting. New containers must be applied manually. Unusable for those using auto temporary containers.

Doesn't work with Yandex Mail. - Kicks out from account after 15 minutes

this one causes audio glitches while watching video on various websites

It does the job, but it doesn't seems to get the silverlight that has installed on the system, somehow it can't use that and referring to the window where it's need to installed again.