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:

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.

Rated 4 out of 5 stars

Very useful extension.
Would be nice if the toolbar icon would be more inline with firefoxes new button style though.
See here for an example:

Totally Useless Rated 1 out of 5 stars

In my FF5 browser this addon didn't work when i swiched to IE8 user agent. I couldn't access any Microsoft webssite. I tried with "Windows update", "Livemail" & "Microsoft answers".None worked so i uninstalled and then i installed "IE Tab+" which works fine and have had no problems accessing M-soft websites. Save yourself sometime and do the same!

Rated 3 out of 5 stars

I'm trying to get google plus to work in seamonkey. I read that you should use this to make your seamonkey look like ie8. Doing this made google look really ugly, there was no way to get out of HTML mode. Also, the entire menu under "SeaMonkey" disappeared, and google plus still wouldn't let me in. I then tried "iphone 3" and google plus let me in but there were other GUI issues so I just deleted the plugin.

Rated 5 out of 5 stars


Rated 5 out of 5 stars

Here is a complete list of user agents (it has browser like Chrome, Safari, and Opera):

problem with bookmarks toolbar Rated 2 out of 5 stars

This addon obstructs proper display of bookmarks toolbar. At least, with "User Agent Switcher" enabled only half the bookmarks on my toolbar are displayed. When disabled, my toolbar returns to normal. Will keep disabled until really needed or perhaps switch to other addon for functionality needed. (firefox 3.6.17)

Firefox 4 Options Location Rated 4 out of 5 stars

To all those having problems finding the options in FF4: To see the User Agent Switcher options again, you just have to turn on the Menu Bar, which is turned off by default in Firefox 4.

Firefox Button In Top Left --> Options --> Menu Bar

Rated 4 out of 5 stars


Doesn't work for me (no context menu).
My setup is: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
I wish you could fix this bug , very useful addon that can replace the old IE Tab 2


Rated 3 out of 5 stars

This addon should tell you what your current user agent string is.. secondly provide an option to set the default agent string so on startup its already modified to your chosen settings.. third option is set agent string for certain far you need separate extension (UAcontrol) for all those last two making this extension kinda pointless. It doesn't even come with an upto date agent string library or a link to easily fetch the maintained list.