Firefox doesn't do email. How is that related to Firefox or to Mozilla? Or is your question about Thunderbird? A screenshot of that page might be helpful. See this support article. [https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem How do I create a screenshot of my problem?] It is best to use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed a maximum file size of 1 MB. Then use the '''Browse ....''' button below the '''''Post a Reply''''' text box to upload the screenshot.