I keep getting the the following responses "400 Bad request" "Your browser sent an invalid request" on various Sites; what is happening?.

There is really nothing that I can add apart from the fact that I am using an HP TouchSmart 310 which I have had for about two months and the problem started about three weeks ago.

This issue 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"
*http://support.mozilla.com/kb/Deleting+cookies

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