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.

Search Support

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

Size of a request header field exceeds server limit.

  • 1 tontu
  • 0 am na jafe-jafe bii
  • 11 views
  • i mujjee tontu mooy cor-el

more options

For several weeks now I have been a Bad Request error when trying to sign into my bank account:

Bad Request

Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit.

Things work fine when I use Google Chrome, but I do not view that as a long-term fix. Can you help?

For several weeks now I have been a Bad Request error when trying to sign into my bank account: Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit. Things work fine when I use Google Chrome, but I do not view that as a long-term fix. Can you help?

All Replies (1)

more options

This issue is usually caused by corrupted cookies.

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

  • Settings -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Settings -> Privacy & Security
    Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear