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Why does Yahoo Mail close right after I open an attachment (pdf, jpg, Word, Excel, etc.) only on Firefox?

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Right after I open or save an attachment from Yahoo Mail while using Firefox, Yahoo Mail closes all of a sudden. This just started happening about 2 months ago, in June this year. I don't think I changed any settings.

Right after I open or save an attachment from Yahoo Mail while using Firefox, Yahoo Mail closes all of a sudden. This just started happening about 2 months ago, in June this year. I don't think I changed any settings.

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Hi Ed, your question was one of many about Yahoo Mail closing after downloading a file. Since this thread will lock automatically in about 5 weeks, here is the latest thread in case you want to follow new discussion or contribute any solution you've found:

https://support.mozilla.org/questions/1401782