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I am unable to use IM orSMS with my yahoo email with updated version of firefox, why?

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Instant messaging and text messaging no longer work from my yahoo email account after upgrading to the latest version of Firefox. The instant messaging and SMS features do work when the email account is accessed using Internet Explorer.

Instant messaging and text messaging no longer work from my yahoo email account after upgrading to the latest version of Firefox. The instant messaging and SMS features do work when the email account is accessed using Internet Explorer.

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Its known issue, see;

maybe its fixed on nightly?