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When viewing emails, the 1st letter "D" is highlighted in all emails. How do I stop this?

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When viewing my emails in either the right pane or opening my emails fully...the 1st letter "D" is ALWAYS highlighted. If I don't un-highlight the 1st letter "D" when I print...only the letter "D" will print. This happens in all my emails and in all email accounts. It is only the 1st letter "D". It also only happens on 1 of my computers. Any ideas?

When viewing my emails in either the right pane or opening my emails fully...the 1st letter "D" is ALWAYS highlighted. If I don't un-highlight the 1st letter "D" when I print...only the letter "D" will print. This happens in all my emails and in all email accounts. It is only the 1st letter "D". It also only happens on 1 of my computers. Any ideas?

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Start Thunderbird in safe mode by holding the shift key while launching it. Does it work now? If so you have an add on or theme causing this issue.