I use this to watch HD videos Rated 4 out of 5 stars

Probably not the normal case usage though. But this lets you get around dumb filtering decisions. One star off as you have to hunt around for agent profiles that aren't included, but those aren't terribly hard to find.

However this combined with FFMpeg, lets you watch HTML5 HD via WebM while still eking out life on a machine with WinXP as the OS. (Don't ask how I figured that out.) Apparently some content or content quality is blocked if those sites don't think you'll meet their ideal requirements, and this add-on allows for a workaround.

Works with a caveat Rated 5 out of 5 stars

Works beautifully with a caveat. You also have to install user_agent_js_fixer to get to work on most web sites now-a-days.

Additional User Agents are found here: http://techpatterns.com/forums/about304.html

Request for Enhancement: allow certain web sites to be fixed to a particular user agent. (UA Control does not work with user_agent_js_fixer.)

Rated 5 out of 5 stars

Works flawlessly. Icon can be placed anywhere from menu > customize.

Does not work. Rated 1 out of 5 stars

Makes no change to user agent string regardless of which profile you select.

NOT WORKING HERE. Rated 1 out of 5 stars

Does nothing on this site.www.whatsmyua.com/

Rated 1 out of 5 stars

Did not add button. No way to activate websites. If it takes more than five minutes to figure out how to turn it on, something is wrong.

Rated 5 out of 5 stars

The best user agent switcher out there. I use both the firefox and chrome versions of this addon.

Pointless, only works briefly. Rated 1 out of 5 stars

The author knows the user agent resets every time Firefox is started but does nothing to deal with this.

Çok kullanışlı Rated 5 out of 5 stars

Çok kullanışlı. Ben kullanıyorum tavsiye ederim.

Still working Rated 5 out of 5 stars

For linux users this works great, no issues at all.

A list, if you don't know how to find one.

This user has a previous review of this add-on.

Rated 1 out of 5 stars

Right now, has been disabled for a week over numerous restarts ... but still exists in my menu bar and still starts up each time firefox does.

VERY disconcerting

Reset on startup Rated 4 out of 5 stars

This is a great addon. To be perfect I had to edit the extension to get rid of that annoying reset on close, to keep user agent between sessions. Fortunately it worked! :D

Rated 3 out of 5 stars

Very few pre-defined profiles. You have to pay for yourself, which is inconvenient. Crooked is integrated in a new menu, ugly.

It's perfect Rated 5 out of 5 stars

It works as mentioned. Great addon.

It really works on latest Seamonkey 2.33 Rated 5 out of 5 stars

Althought it is stated that this add-on doesn't works on SeaMonkey 2.33, it is working.

Also, it is better to download the new updated user-agent strings throught the link provided on the Options dialog box.

Rated 5 out of 5 stars

This add-on is working well for me emulating a mobile device on my desktop to benchmark search engine results in preparation for Mobilegeddon on 21st April.

Does what it says it will do Rated 5 out of 5 stars

I use Waterfox as my main browser and there is one site I use for work that insist you use Internet Explorer. I tried using IETab addon which almost worked but wouldn't display the login boxes making it useless. With User Agent Switcher all I have to do is select IE as the user agent and the site is ully accessible with no need to fire up Internet Explorer. Great addon which makes things so much simpler for me.

No Update for 4 Years - Abandoned Rated 4 out of 5 stars

The developer posted a comment in 2013 saying an update was coming in early 2014, but it never did. There are basic features, like the ability to set a default user agent and have it be persistent, that would be nice. The list of user agents is maintained by another person.

It seems the developer of this addon is either too busy or has lost interest.

Rated 5 out of 5 stars

Easy to use add-on and the most important is that it's working 100%!
Excellent! :)

Please add a feature to enable at FF startup. Rated 4 out of 5 stars

Very light add-on.