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Can't get into talk talk email account in Mozilla, you have undefined new mails in your inbox message. No problem with Internet Explorer though

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I've been using the Firefox browser for nearly a year now but for the past three days I can't open my tiscali email account via Firefox. The message "you have undefined new mails in your inbox" comes up. Talk Talk technical help says there is a problem with Firefox and advised me to use Internet Explorer. I can get into my account through Explorer but would much prefer to use Firefox so please help me out.

I've been using the Firefox browser for nearly a year now but for the past three days I can't open my tiscali email account via Firefox. The message "you have undefined new mails in your inbox" comes up. Talk Talk technical help says there is a problem with Firefox and advised me to use Internet Explorer. I can get into my account through Explorer but would much prefer to use Firefox so please help me out.

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Apparently TalkTalk mail will work with Firefox 4 and Firefox 5 if you set the browser to lie to TalkTalk mail by saying that you are still using version 3.6.

You can find the instructions for that in a post on the TalkTalk forums: Firefox 4 & TalkTalk webmail - Forums.

Note: when you open about:config the first time, it will display a warning message that you should be careful with the changes you make. That's definitely good to bear in mind.

Does it work?