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address & subjet field in thunderburd

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how do i change the font size and style in Thunderbird 1040b1 for the subject and address fields

how do i change the font size and style in Thunderbird 1040b1 for the subject and address fields

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This is a general step that increases fonts somewhat. It may do what you wish. In tools>settings>general scroll to bottom where config editor is. the entry to change is layout.css.devPixelsPerPx the default is -1. Try maybe changing to 1 or 2 and see how that looks, but be careful if you set too high. I suggest 1.1 for a start.