Rated 5 out of 5 stars

This is a good user agent switcher! It will change the user agent to your selection and it also provides a direct link to download additional user agents. I've ran this against FF24, FF25 and FF25.0.1

For 24, the appName and User agent will be changed to your selected user agent type. For example selecting MSIE, the navigator appName will reflect "Microsoft Internet Explorer"

In 25 and 25.0.1, the user agent switches perfectly but the appName will remain as Netscape, no matter which user agent you select. I think 25 and 25.0.1 may have broken something that this plugin uses.

I will be submitting a bug report. Still a A+++ plugin!

THIS APP IS A *MUST-HAVE* FOR EVERYONE Rated 5 out of 5 stars

Does a great job getting them to load as https rather than their default http, which is invaluable in many situations. Great when you want to hide your User Agent, from your internet provider allowing you to use your real UA instead of spoofing,(example: tethering using a a mobile phone service provider that looks for computer based browser User Agent strings, and will freeze your service if found, usually redirecting all DNS to a webpage telling you you've been caught tethering and you need to pay $10+ or upgrade your service, which I believe is bogus and should be against the law.) With HTTPS your traffic is encoded so your ISP never sees your user agent! No more faking a Nexus tablet!Great for providing that extra security when sending or receiving sensitive information. Preventing locally networked, or 3rd parties from sniffing network traffic and obtaining, or analyzing your activities. etc... It's all about Security!

Set default? Rated 5 out of 5 stars

Essential for my nefarious needs. Would like to set an agent as default instead of resetting every time FF is restarted.

very Useful Rated 4 out of 5 stars

i've been running linux nightly builds of ff for years and too many site 'developers' ("webmasters" lol) just don't get that 'everyone' are not running windows internet exploder, So 'spoofing' your useragent (UA) is is very helpful as a workaround to both these issues.
(*note, we used to be able to accomplish this in about:config > general.useragent* , but in Gecko 2x, FF higher than 18 (27.x) does not support UA overrides, that I have found... )
Thanks, Landis.

Useful Rated 5 out of 5 stars

Disguise yourself to a web spider and stalk into the hidden areas! :)

Identify Rated 3 out of 5 stars

Problem is, you can switch what you want. If you have javascript.enabled;true,then every website can detect your real OS and the FF-InstallTime20130910xxxxxx = v24.0

Bump up to SeaMonkey 2.21 Rated 4 out of 5 stars

This extension works with SeaMonkey 2.21, but I had to bump up the max version to get it to install.
It would be nice if the list of fake user agents included the other parameters that can be entered into the editor other than just the UA string for the browser's header.

Rated 5 out of 5 stars

Best helpful add-on!!
Thank you

Rated 4 out of 5 stars

nice addonei would like yo be able to set per web site user agent, as some sites do not work on some user agents, while others open more more content to some user agents.

Rated 4 out of 5 stars

Simple and sweet. The best bart is tht you can import a list of user agents, actively maintained in forums.

A request (and it would become 5 star):
The user agent is reset upon restart. Please provide a setting to prevent this.

Rated 5 out of 5 stars

User agent switcher works well and is regularly updated.
A very large of user agents can be imported that goes above and beyond the installed list.Larger List of User Agents for import:

or directly at:


Please note 'User Agent Switcher' comes installed with a good list of user agent by default. However, if you want a ton more use the link above.

Rated 3 out of 5 stars

May I have a list of User Agent?

Rated 4 out of 5 stars

szkoda, że na start mało jest wbudowanych user agentów

Even my Mom uses this! Rated 5 out of 5 stars

I have FF on Ubuntu, and my Mom's employer has this stupid website that forces to use IE even though the pages render correctly (they redirect to a 'use IE' page by detecting browser agent). It took me 2 minutes to set this up and teach her. This is why I love Firefox, thanks for the 'simple' add-on.

Rated 5 out of 5 stars

Great addon!

Works good Rated 4 out of 5 stars

But I wish it came bundled with some User-Agent strings. Also, the switcher UI is a little cumbersome.

Rated 5 out of 5 stars

it does a good job in most sites ,except the one "m.taobao.com/channel/act/mobile/h5/10nian.html".and chrome works normally with "F12" .it's hard to express express what i mean with my poor english.= =

Rated 5 out of 5 stars

Really useful for testing. Unfortunately, I need to some environment sniffing, and the fact that this tool can set both useragent and navigator.platform is great.

navigator.userAgent support is currently broken due to a bug in Firefox, but it looks like that will get fixed in Firefox 22. In the meantime, you can manually go to about:config, set general.useragent.override to what you want, then restart Firefox.

best add-on Rated 5 out of 5 stars

Excellent add-on on Firefox

Rated 4 out of 5 stars

clash with session manager in firefox 20.0.1