Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

ابحث في الدعم

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

wrong version number

  • 5 ردود
  • 36 have this problem
  • 1 view
  • آخر ردّ كتبه cor-el

more options

HI!

I'm using firefox 3.6.9 hungarian version, but a lot of site, and firefox add on think's i'm using firefox 2.0.0.5 version. Reinstalling, updating, retart (browser, computer etc) not helping. This "started" (well not started, just realized something is wrong) about more than a year ago, when youtube decide not to support the old browsers. First i belived the sites are wrong, but now too many sites thinks that i have old version browser, even your addons site too.

HI! I'm using firefox 3.6.9 hungarian version, but a lot of site, and firefox add on think's i'm using firefox 2.0.0.5 version. Reinstalling, updating, retart (browser, computer etc) not helping. This "started" (well not started, just realized something is wrong) about more than a year ago, when youtube decide not to support the old browsers. First i belived the sites are wrong, but now too many sites thinks that i have old version browser, even your addons site too.

الحل المُختار

Hello ,

the cause of this issue is a bad so called useragent string.

Please reset the UA string the following way:

  1. Enter about:config in Firefox and press the Enter key.
  2. Confirm the upcoming warning by clicking I'll be careful, I promise.
  3. Filter the list for general.useragent.
  4. Repeat the following step for every bold line that you find:
  • Right-click the bold line and select Reset.

Now the websites should recognize your version again.

Read this answer in context 👍 8

All Replies (5)

more options

الحل المُختار

Hello ,

the cause of this issue is a bad so called useragent string.

Please reset the UA string the following way:

  1. Enter about:config in Firefox and press the Enter key.
  2. Confirm the upcoming warning by clicking I'll be careful, I promise.
  3. Filter the list for general.useragent.
  4. Repeat the following step for every bold line that you find:
  • Right-click the bold line and select Reset.

Now the websites should recognize your version again.

more options

FYI: That user agent corruption is in your case caused by the MegaUpload toolbar.

more options

@cor-el: the funny part is there aren"t any megaupload toolbar installend on my computer

Modified by facesiki

more options

@Tobbi: thank you this was helpful

Modified by facesiki

more options

You can see by the user agent (2.0.0.5;MEGAUPLOAD) that it must have happened in the time that you used Firefox 2.0.0.5 (2007071317) and that is quite a few years ago. If you do not reset preferences added by an extension after removing an extension then you will still have those preferences active in prefs.js and some like this one can have effect years later. If you have such an old profile then maybe it is time to create a new profile to get rid of all leftovers from such old versions.

See also:

http://kb.mozillazine.org/Resetting_preferences
http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows