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Websites say that Firefox is outdated or incompatible even though it's the latest version

Some websites or add-ons require that you use a specific browser or version and then make a mistake detecting your installed version of Firefox. This can cause the following problems:

  • Websites will not work correctly, will report that your browser is outdated, unsupported, or incompatible, or will suggest that you upgrade your browser, even though you have the latest version of Firefox.
  • You are not able to install extensions or themes from the Mozilla Add-ons website because it incorrectly detects that you are using a different browser or an older Firefox version.

Firefox is showing the wrong User Agent

If the website or add-on is compatible with your installed version of Firefox, the cause of the problem may be in your Firefox "User Agent" string, that identifies your browser type to websites. You can remedy this problem by resetting your user agent in your Firefox preference settings.

To reset your user agent:

  1. In the address bar, type about:config and press EnterReturn.

    • The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!I accept the risk! to continue to the about:config page.
  2. Search for useragent by typing it into the Search field.
  3. Right-clickHold down the Ctrl key while you click on each of these preferences, if they exist, and select Reset from the context menu.
  • general.useragent.extra.firefox
  • general.useragent.extra.productName - where productName can be the name of some third party software (e.g. microsoftdotnet).
  • general.useragent.locale
  • general.useragent.override
  • general.useragent.security

reset_ua1.png

After resetting your user agent, you may need to clear your cookies and cache:

  1. Click the menu button New Fx Menu , choose History and select Clear Recent History....
  2. In the Time Range to clear: drop-down, select Everything.
  3. Click the arrow next to Details to display the list of items that can be cleared.
  4. Select both Cookies and Cache.
  5. Click Clear Now.

If resetting the above preferences does not work, see:

Websites think that Firefox is outdated when you have the latest version

Some websites incorrectly see the latest version of Firefox as version 1 (instead of version 10 or above) and will think that Firefox is outdated, incompatible, or not supported. We are working with websites to get them to fix this. In the meantime, you may just be able to ignore the message but you should report the problem website:

Occasionally you may come across a page that simply doesn't work in Firefox. If that happens, please report the problem to Mozilla as follows:

  1. Click the menu button New Fx Menu , click help Help-29 and select Submit Feedback.... The Submit Your Feedback page will load in a new tab.
  2. Click on "Firefox makes me sad".
  3. On the Details page that comes up, briefly describe the problem, and enter the URL of the problematic webpage.
  4. Click the Submit button.

Workaround for broken websites

You may be able to restore functionality by temporarily disguising Firefox as another browser. To do that, you can install the User Agent Switcher extension:

  1. Go to the User Agent Switcher add-on page.
  2. Click the green Add to Firefox button and install the add-on.
  3. Click Restart Now.

When Firefox restarts, you can disguise your Firefox user agent so that websites think you are using Firefox 9.0.1, as follows:

  1. For Windows 7 and Vista, press the Alt key to bring up the old-style menu bar at the top of the Firefox window.
  2. Go to the Tools menu, down to Default User Agent and then select Edit User Agents....
    user agent switcher
  3. In the User Agent Switcher options window, click New and select New User Agent...
  4. In the User Agent window, add a description (for example, Firefox 9), change the last number of the user agent to 9.0.1 and then click OK.
    user agent switcher 3
  5. Next, go back to the Tools menu, down to Default User Agent and this time select the new user agent that you just created.
    user agent switcher 4
  6. Finally, reload the page and it should work normally.
  1. Go to the Tools menu, down to Default User Agent and then select Edit User Agents....
  2. In the User Agent Switcher options window, click New and select New User Agent...
  3. In the User Agent window, add a description (for example, Firefox 9), change the last number of the user agent to 9.0.1 and then click OK.
  4. Next, go back to the Tools menu, down to Default User Agent and this time select the new user agent that you just created.
  5. Finally, reload the page and it should work normally.
Note: User Agent Switcher will automatically restore the Default User Agent when you next close and restart Firefox. You will need to reselect the new Firefox 9 user agent, each time you restart Firefox and visit the problematic website.
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Related discussion:

I'll unarchive it. I think we should rename it to "Websites say I need to update Firefox but I'm on the latest version" and use the instructions right out of Latest Firefox issues - assuming the problem is that the website is doing their UA sniffing incorrectly. We should also include information about undoing these changes and how this isn't a permanent solution. You should contact the website and tell them to fix it or report it us. We're already working with the sites we know about to get them to fix things.

Instead of renaming to "Websites say I need to update Firefox but I'm on the latest version" I would prefer something like "Websites think that Firefox is outdated when I have the latest version" "Websites incorrectly report that Firefox is outdated or incompatible" for the article name and "Websites think that Firefox is outdated when you have the latest version" for the new fx10 section.

I posted the following in https://support.mozilla.org/en-US/kb/latest-firefox-issues/discuss/2310#post-5004

On suggesting the User Agent Switcher extension workaround, under the section, "Websites say I need to update Firefox but I'm on the latest version":
  • Change section title, to avoid confusion with the upgrade from 3.6 home page issue? The Firefox 10 (2-digit) issue and UA switcher workaround seem to be more about fixing broken websites and "incompatible" or "unsupported browser" messages, rather than websites saying you need to update Firefox (bug 690287, linked from the Firefox 10 release notes).
  • Mention that the UA will be automatically reset to default when you next restart Firefox?
  • Will the UA switcher workaround cause other problems, like a wrong UA in the support forums?

I made a revision to this article that needs review.

P.S. Based on my revision, I would rename the article:

Websites incorrectly report that Firefox is outdated or incompatible

I think we can remove the "other causes" section and the info about incompatible add-ons. The current issue is really just about the new two digit number on the end of the UA string.

I would leave it. A quick search on "MegaUpload useragent" brought up multiple threads. Examples:

These and "Creative ZENCast" issues all seem to be old and low volume at that. None have any current votes or replies. Also, megaupload was shutdown last month and it seems that you can no longer download their toolbar (I tried the first page of google results without luck).

MegaUpload was one example.

https://support.mozilla.org/en-US/questions/907986 was solved last month. The original post's UA was Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7 Congoo NetPass

https://support.mozilla.org/en-US/questions/749161 has one new vote this week. The original post's reported UA was Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.8.1.16) Gecko/20080702 Firefox/2.0.0.16 GVUser

P.S. There are lots of other examples. People are still using this article when users report a current Firefox version and an old UA . It would have been better to leave this article archived, rather than update / rename it and remove all the original information.

https://support.mozilla.org/en-US/questions/912162 was posted three weeks ago by Firefox 9.0.1 user with Firefox 3.5.5 UA

I made a new revision tor remove references to MegaUpload and "Creative ZENCast".

Ok this looks good. Thanks for working on it Alice. I'm going to approve it and rename it to what you suggested - Websites incorrectly report that Firefox is outdated or incompatible

No problem. Thanks for approving and renaming it.

This article is probably outdated. Should we remove the Websites think that Firefox is outdated when you have the latest version section? Redirect to How to reset the default user agent on Firefox?

Maybe it would be the best to archive this article. Most of the content is meant for Firefox 10 which is no longer supported on SUMO. The other part is already described in How to reset the default user agent on Firefox.

Marko said

Maybe it would be the best to archive this article. Most of the content is meant for Firefox 10 which is no longer supported on SUMO. The other part is already described in How to reset the default user agent on Firefox.

I agree that it would be best to archive this article and then maybe update How to reset the default user agent on Firefox to add any keywords or useful content that may be missing.

I've added "Archive this?" to the thread title so that others seeing this thread can weigh-in.

AliceWyman said

I agree that it would be best to archive this article and then maybe update How to reset the default user agent on Firefox to add any keywords or useful content that may be missing.

I went ahead and added keywords, a new search summary, and a link to https://wikipedia.org/wiki/User_agent to How to reset the default user agent on Firefox.

Great, you can probably archive this now.

Marko said

Great, you can probably archive this now.

Done.

While I was at it, I added How to reset the default user agent on Firefox as a related article. It now shows up as a "see also" link at the bottom of this article.