Firefox 32.0.1 installed on my Mac OS 10.6.8 and links from Mail no longer open. Click a link and Firefox opens, but the link doesn't appear or activate.
Some users have a similar problem to this, but if FireFox is already open the link from their mail client will activate in FireFox. For me, once I click a link in an email, FireFox immediately becomes the active application, but nothing further happens. FireFox has been the default browser for ages, but I stopped that, and set Safari as the default. Then quitting and re-opening FireFox I re-established it as the default browser, but the problem persists.
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It amuses me that the email that was sent to confirm the posting of this question had a clickable link. Naturally that link did not work. Cutting and pasting it into FireFox allowed me to complete the posting process. Annoying.