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Error Message

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When I log into my TD financial account, I always now get the message "Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit", and I crash out of my site. I will even sometimes get the message when I log out. What's going on? When I log into my TD account using Microsoft Edge, I don't have this problem. After years using Firefox with no issues, now I have this these last few days. What's going on?

When I log into my TD financial account, I always now get the message "Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit", and I crash out of my site. I will even sometimes get the message when I log out. What's going on? When I log into my TD account using Microsoft Edge, I don't have this problem. After years using Firefox with no issues, now I have this these last few days. What's going on?

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This issue can be caused by corrupted cookies or blocked cookies.

  • check the permissions for the domain in the currently selected tab in "Tools -> Page Info -> Permissions"

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

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

  • switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

If clearing cookies doesn't help, it is possible that the cookies.sqlite file in the Firefox profile folder that stores the cookies got corrupted.