Mozilla VPN is currently experiencing an outage. Our team is actively working to resolve the issue. Please check the status page for real-time updates. Thank you for your patience.

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

Gives me an error message 400 Bad Request. Says "browser sent a request that this server could not understand. Size of a request header field exceeds server lim

  • 3 replies
  • 3 have this problem
  • 1 view
  • Last reply by cor-el

more options

I only get this message when I click on a link from a WebMd email. Funny thing is it used to work until i got a new upgrade from Firefox.

I only get this message when I click on a link from a WebMd email. Funny thing is it used to work until i got a new upgrade from Firefox.

All Replies (3)

more options

This can be caused by corrupted cookies.

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

  • Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

  • Tools > Options > Privacy > Cookies: "Show Cookies"
more options

Actually it did say something about a cookie on the next line so the first thing i did was delete all the cookies. Not via this route but through Internet options on Windows.

more options

Firefox manages its own cookies, so clearing the IE cookies won't have any effect.