Good, but breaks youtube full screen Rated 3 out of 5 stars

Great to be able to spoof the UA. I use it with UAControl (

The current version (1.3.1) blocks the full screen mode in youtube videos (the one toggled from the video controls). Is that by design (necessity)?

EDIT: In I use
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36 "
that is set as the custom "Default for sites not listed" in UAControl

I can toggle the state (dis/en-abled) of the in-player full screen control, just by en/dis-abling UAControl 1.3.1-signed and reloading the page.

Other data: FF 40.0.3 on Mac OS 10.10.5 (14F27).

Works! Thankyou Rated 5 out of 5 stars

Can finally use many sites that still unfairly block Firefox.

Rated 5 out of 5 stars

Hi thanx for this plugin!

Does it also work with "random agent spoofer" addon? where can i test it ?

Breaks mail composer Rated 4 out of 5 stars

I have to disable it since it stops mail composer from working:

TypeError: stateObj is undefined driver:1686 (

Help me

I'd like to fix this bug, but I can't create an account at Lycos Webmail, it's not available in my country. Could you please create a new account and give me the password? Please use leandrotp22 as the user name. Thanks.

Suggestions for "bugs" Rated 4 out of 5 stars

As godspeed noted before, it would be useful to change the.about:config option -> general.oscpu.override to coordinate with the value of the selected UserAgent string. For example, if the string is "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0" then simply copy the "Windows NT 6.1; WOW64" part to an about:config setting called "general.oscpu.override". Very simple, and one COULD do it themselves, but implementing an automated manner reduces mistakes, forgetfulness, etc.

Further, but trickier, is to set the about:config option for "general.platform.override" to coordinate with the oscpu value. Continuing from the above example, "Windows NT 6.1; WOW64" is equivalent to Windows 7 x64, so the "general.platform.override" value would simply be "Win64".

I understand that this example was easier than extracting the value for some unix setup running a googlebot user-agent, but it still shouldn't be so hard, and makes for a complete functionality to the addon. Oh, check out - - for help detecting the correct values of the above strings.

Finally, I would like to say that for the vast majority of websites, simply changing the UA-string (and related), disabling/clearing cookies, and such remedial steps is sufficient to FOOL them, for big name sites such as Gooogel -- changing these values wouldn't be a drop-in-the-bucket to prevent your browser/OS/IP, etc being fingerprinted. For those interested in how easily their browser is fingerprinted (or how unique it is), see - - or for the paranoid, see - -.

Thanks for considering making this add-on more complete. Please reply here as you don't list a support-site or email.

Rated 5 out of 5 stars

With UAControl, this addon only changes navigator.userAgent when the mode is NOT <Block>. So I've set my default UAControl method to a 'blank' custom useragent which is just a space (' '), and only when a custom is set does it change navigator.userAgent. But I'd rather use the <Block> method of UAControl and send no useragent header at all. Would it be possible to make this script blank/null navigator.userAgent also when UAControl is set to block?

This review is for a previous version of the add-on (1.2.1-signed.1-signed). 

Thanks for reporting, the error is fixed in the new version. Download it here:

Not convinced so far Rated 2 out of 5 stars

Looking to fake your browser user agent? This add-on is contributing the javascript part missing in other user-agent related add-ons.


Any website where you enable javascript can see right through your fake because this add-on does not cover the navigator.oscpu part of the user agent.

So whatever OS you set in your user agent, the navigator.oscpu call will still detect your real OS (unless of course you change it manually in about:config).

And there you are... easier to identify than people with no fake at all.

I suggest the developer fix this pretty fast.

This review is for a previous version of the add-on (1.1.1-signed.1-signed). 

Rated 5 out of 5 stars

Excellent. Thank you.

This review is for a previous version of the add-on (1.1.1-signed.1-signed). 

Rated 5 out of 5 stars

A must-have addon for UAcontrol and/or User Agent Switcher users.

This review is for a previous version of the add-on (1.1.1-signed.1-signed). 

The circle is complete Rated 5 out of 5 stars

You need this addon.

This review is for a previous version of the add-on (1.1.1-signed.1-signed). 

Rated 5 out of 5 stars

thx for this useful add-on!

This review is for a previous version of the add-on (1.1.1-signed.1-signed). 

Rated 5 out of 5 stars

If the code is open, you can see and use the sample?


new Date().toLocaleString(); // 4 February 2012 г. 00:00:00
123456.789.toLocaleString(); // 123 456,789

This review is for a previous version of the add-on (1.1.1-signed.1-signed).  This user has a previous review of this add-on.

Я счастлив :))) Rated 5 out of 5 stars

Поставил (версию 1.1) к расширению UAControl и теперь при разрешённых скриптах сайты видят тот user-agent который я им показываю, а реальный остаётся надёжно скрыт.
То что надо, этого как раз не хватало! Спасибо!

This review is for a previous version of the add-on (1.0.1-signed.1-signed).