Nice Rated 5 out of 5 stars

I use it since FF 3.X, and i'm already at FF9, without any problems.

Epic when you work with Mobile Web. Of course it does not emulate the html rendered by the devices but the main use is to test the behavior of some application in lots of user-agents.

5*

Rated 5 out of 5 stars

Somehow I installed this on Firefox v9.0.1 and it works perfectly fine, helping me to download HDMOV movie trailers from apple.com. Doesn't slow the browser down, the button looks fine with my theme. Handy addon.

It makes browser UGLY slow! Rated 2 out of 5 stars

This plugin makes browser UGLY slow!
Just try to open new window (Ctrl+N). The browser and system hungs up for a few seconds during this operation.

Tested on browser: FF 3.6

Rated 5 out of 5 stars

This is a great extension and very useful. However, it does not work with SeaMonkey 2.6. I delayed updating SeaMonkey when it told me that this extension would be disabled if I updated from 2.5 to 2.6.

Great Add-on Rated 4 out of 5 stars

Many thanks for this add-on, it's an invaluable tool for accessing websites that falsely declare "your browser is incompatible/outdated." Only concern is the toolbar icon - it increases the size of the add-on bar when placed in it, and when in the navigation bar it does not have the same button style as the other icons.

Rated 5 out of 5 stars

I translate header this page https://addons.mozilla.org/en-US/firefox/addon/user-agent-switcher/

I am Russian, and bad know English, correct my mistakes.

Original English text:

About this Add-on:
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

My additions in English:

About this Add-on:
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser. Allows you to mask your browser and operating system. You can export / import of settings in the XML.
For example, to view the video without adobe flash plugin (with HTML5), choose User-Agent - Iphone.
User Agent to Firefox is restarted not reset to default, and is stored, you must:
about: config
create new string value:
useragentswitcher.reset.onclose true

My Russian translation:

Об этом дополнении:
User Agent Switcher это дополнение, которое добавляет меню и кнопки на панели инструментов браузера для переключения строки user-agent при обращении браузера к сайтам. Позволяет маскировать свой браузер и операционную систему. Возможен экспорт / импорт настоек в xml.
Например, для просмотра видео без adobe flash (HTML5) следует выбрать User-Agent - Iphone.
Чтобы User Agent при перезапуске Firefox не сбрасывался на default, а запоминался, необходимо:
about:config
create new string value:
useragentswitcher.reset.onclose true

Great but have to download more agents Rated 5 out of 5 stars

Check out what sites are redirecting mobile users with the iPhone user agent. Need to find more user agents to import though.

Rated 5 out of 5 stars

Great extension, but it should come with a more complete list of user-agents built in (along with all the other variables) so that by default there is a longer list of web browsers and bots and mobile devices you can have Firefox impersonate, and also having different versions of each browser (including Firefox). Everything else about this extension is perfect, the only flaw is the rather short default list of user-agents. And it works perfectly in Firefox 8.0.

Rated 3 out of 5 stars

This plugin needs a feature where it starts with Firefox using the last used useragent. I hate how I constantly needs to switch it.

Good, but limited options. Rated 3 out of 5 stars

This addon changes the user agent globally (for every site). If you want to just change the user agent on a site-by-site basis, install the UA Control addon: https://addons.mozilla.org/en-US/firefox/addon/uacontrol/

Rated 4 out of 5 stars

Sehr nützlich und funktioniert zuverlässig.

Rated 4 out of 5 stars

If u add some more environment it will be more strong & useful ****

Rated 1 out of 5 stars

Didn't add a user agent switcher, added a persistent and useless tool bar. Uninstalled.

Rated 5 out of 5 stars

Works fine on 9.0a1 still, either enable the menu bar or tap alt to show it, and then the app is accessed through the tools menu just as it always was.

Didn't work for me Rated 2 out of 5 stars

Didn't even show a button on FF5. No way to activate it. A shortcut would be nice.

LET'S MAKE THIS REVIEW SHORT Rated 5 out of 5 stars

This add-on is a "must have." I don't know what I can do without this thing. Finally, I can visit mobile sites :D

Rated 5 out of 5 stars

Respected Sir
I Want To Inform you that user agent switcher 0.7.3 dosen't work with mozilla firefox latest version firefox 7 beta or firefox 8 or 9 alpha

so kindly update my one of favorite addon user agent switcher 0.7.3

please update

Rated 5 out of 5 stars

Works great, you have to add the icon to the toolbar to make it visible.

Rated 5 out of 5 stars

COOL add-on!!! I downloaded firefox just bcoz of this add-on. You can create any user agents for most of the mobiles.. N mine has a user agent of iPhone too. =)

Rated 4 out of 5 stars

Very useful indeed. Would be helpful if it had more mobile browser user agent strings built in (e.g. iPhone, Android, etc.), as that is what a lot of people will want to use it for. Button appearance is also out of step with those used since FF4, but not a big problem.