Firefox 7 on a MacBook Pro cannot make attachments to outgoing MobileMe Mail. If I run MobileMe Mail on Safari it works fine. I assume therefore that there is some conflict between MobileMe and Firefox 7?
When using MobileMe Mail in Firefox 7, clicking the little paperclip to make an attachment does nothing. More precisely it opens a Finder window where you can select a file, but then the file simply does not attach and the finder window closes. Using MobileMe Mail from within Safari works fine, also works fine from within the Mail app itself. Only in Firefox does this problem occur
When using MobileMe Mail in Firefox 7, clicking the little paperclip to make an attachment does nothing. More precisely it opens a Finder window where you can select a file, but then the file simply does not attach and the finder window closes. Using MobileMe Mail from within Safari works fine, also works fine from within the Mail app itself. Only in Firefox does this problem occur
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See also https://support.mozilla.com/en-US/questions/885132
Are there any errors shown in the error console when you try and do an attachment?