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Keep getting "Bad Request (Invalid Verb)"

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I've installed 3.6.3 and am continually getting "Bad Request (Invalid Verb)" on web sites. I refresh and click again, and it usually works fine the second time - however, of course, this is getting quite annoying...

This happened

Every time Firefox opened

== I installed firefox

I've installed 3.6.3 and am continually getting "Bad Request (Invalid Verb)" on web sites. I refresh and click again, and it usually works fine the second time - however, of course, this is getting quite annoying... == This happened == Every time Firefox opened == I installed firefox

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"Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now" "Remove the Cookies" from sites causing problems: Tools > Options > Privacy > Cookies: "Show Cookies"

See http://kb.mozillazine.org/Clearing_the_cache and http://kb.mozillazine.org/Cookies