There are a variety of suggestions but not yet a confirmed solution in this thread: Firefox suddently stopped downloading email attachments.

I can't think of any reason for this to be different between accounts accessed on the same installation of Firefox. Do you manually login/logout of the 3 accounts or do you use an add-on to manage the switching?

Me, too. It probably started back in October or November 2013. I had to switch to Internet Explorer (where the files will download), but I prefer Firefox.

Clear the cache and cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

If you use a bookmark to reach the mail page then try to navigate to the mail page starting with the Yahoo main page or the Yahoo login page.

Hi thescribe, I want to echo the note at the end of cor-el's post: many, many users have discovered all kind of problems and glitches with Yahoo! mail in Firefox when using an old bookmark saved before Yahoo!'s recent server changes.

I suggest clearing your Yahoo cookies and entering through the main page to get a better address for your current mail server.

To remove your Yahoo cookies -- save any pending work first -- call up the Cookies dialog while viewing any page on yahoo.com (or your Yahoo site). You can use either:

• right-click the page > View Page Info > Security > "View Cookies"
• Tools menu > Page Info > Security > "View Cookies"

In the dialog that opens, you can remove the site's cookies individually.

Then go to one of these Yahoo addresses and click on login or mail from there:

• Yahoo home page: https://www.yahoo.com/
• My Yahoo page: https://my.yahoo.com/
• General mail redirect: https://mail.yahoo.com/
• AT&T users: http://att.yahoo.com/
• Other country sites (not on .com): the main Yahoo page for your country

Does that help?

Thank you! I did all three of those things and it works now. I was using a bookmark for the att.net Mail page like you said. I think that's probably what the problem was. It used to work fine. Now I know.