Comment 2 for bug 263976

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Hendrik (joker-x) wrote :

This may be intentional, as Thunderbird saves font preferences separately for every encoding. You can change your preferences via "Edit -> Preferences -> Display -> Formatting -> Fonts...".

If you had previously decreased the font size for your standard enconding (say "Western"), this would explain the discrepancy you see when viewing a message with a different encoding.

See also here: http://kb.mozillazine.org/Font_settings_in_Thunderbird