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Eudora e-mail opens from Firefox, when I want Thunderbird to open; I do not use Eudora any longer, but it is on my computer.

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When I'm surfing with Firefox and click a hyperlink to send an e-mail to whomever, the Eudora e-mail program opens for me to send the e-mail. I DO have Eudora on my computer, but do not use it at all any longer. I use Thunderbird. How do I get Thunderbird to open and not Eudora? I have looked under Preferences on all 3 of the programs (Eudora, Thunderbird, and Firefox) and cannot find an answer.

When I'm surfing with Firefox and click a hyperlink to send an e-mail to whomever, the Eudora e-mail program opens for me to send the e-mail. I DO have Eudora on my computer, but do not use it at all any longer. I use Thunderbird. How do I get Thunderbird to open and not Eudora? I have looked under Preferences on all 3 of the programs (Eudora, Thunderbird, and Firefox) and cannot find an answer.

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