Why can't I open news articles on Yahoo using FireFox? I can open them using a different browser but get an error message when trying to use FireFox. The message is 400 bad request.

Sorry, Bad Request.
Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.
Cookie: B=75kpq496lk13o&b=4&d=sCtogappYEIRcz6KBGzeoYZ9MqTV.a4yAp6fAQ--&s=ka&i=KBG0.9m3_RKQtWi41uCH; CH=Ahs0ZxveIG43DDRlM2sJzTTiDVor

That issue can be caused by corrupted cookies.
*https://support.mozilla.com/kb/Cannot+log+in+to+websites
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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