I get "HTTP Error 400. The request is badly formed." when trying to access a URL that I have accessed previously in the day and works OK with IE.

Hi
I accessed the site earlier in the day but when I came back to it I got the above message. Tried to access the site in IE and all worked fine. Tried disabling DNS prefetch and clearing out history but to no avail. I ran a virus scan but with no threat detected.

That issue can be caused by corrupted cookies.
*http://kb.mozillazine.org/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"

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