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I cannot add email attachments in any email application in Firefox

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Add email attachments does not function in Comcast mail while using Firefox. Cannot add add email recipients in Yahoo Mail unless I revert to "classic mail". Radio buttons such as "Accept all" do not operate on some web site pages--particularly on Tagged.com. All functions work in IE8

Add email attachments does not function in Comcast mail while using Firefox. Cannot add add email recipients in Yahoo Mail unless I revert to "classic mail". Radio buttons such as "Accept all" do not operate on some web site pages--particularly on Tagged.com. All functions work in IE8

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locking duplicate, continue here https://support.mozilla.com/en-US/questions/750171