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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

I see this message when trying to open email. What does it mean?

tuckaway
tuckaway
more options

Those are all the details I have. I can see emails on Explorer but not on Firefox which I prefer. This is the message that appears :

Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit. Cookie: OAX=GAL/BEl4030ACR/8; s_vi=[CS]v1|4978D37E0000074A-A290B540000006C[CE]; RMAM=01cen10_1004.4aD7I9SG|cen9_1004.4aDIGaJm|; edit

Those are all the details I have. I can see emails on Explorer but not on Firefox which I prefer. This is the message that appears : Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit. Cookie: OAX=GAL/BEl4030ACR/8; s_vi=[CS]v1|4978D37E0000074A-A290B540000006C[CE]; RMAM=01cen10_1004.4aD7I9SG|cen9_1004.4aDIGaJm|; edit

All Replies (1)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
more options

Sounds as though you have too many cookies for the site that hosts your email.

If you right-click a page on the site, choose View Page Info, then the Security tab, you can click "View Cookies" and remove some or all of them. Make sure to save any draft messages or other work before doing this, because it probably will log you out.

Does that resolve the issue?