Re: Font/Emoji issue with Thunderbird following update
Assuming the problem to be over-sized emojis in the Subject and From lines, this issue remains (as of this post on 5/8/2018) in Bionic 18.04 and Thunderbird 52.7.0, and can be worked around by uninstalling package fonts-noto-color-emoji (Version 0~20180424-0ubuntu1) and installing package fonts-symbola.
CPU: 80286 @ 10Mhz; FPU: n/a; RAM: 256K, HD: 20 Meg
Graphics: Monochrome; Power Supply: 100 W; Case: Yes/Open