Although TB 57.0b2 fixes the emoji problem it breaks the time/date formatting and the lightning plugin is not (yet?) supported.
There is also the probably related Firefox desktop icon bug: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1760144
Sorry to bump this thread, but something that worked for me was creating a “fonts” subfolder in Thunderbirds’ own folder and placing EmojiOneMozilla.ttf in that folder.
First, download the font itself.
Second, create a “fonts” folder (you need root access for that):
sudo mkdir /usr/lib/thunderbird/fonts
Finally, place the font file in that folder (mine was saved in ~/Downloads, yours may be in some other place, so change the next line, if needed):
sudo cp ~/Downloads/EmojiOneMozilla.ttf /usr/lib/thunderbird/fonts/
Restart Thunderbird and it’s done. Hope it helps!
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@MrRollton, Thank you for sharing this fix! (workaround?). It solves my problem.
An even easier fix:
sudo apt-get install fonts-symbola
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Thanks TuXFrk, (sudo apt-get install fonts-symbola) worked a treat in Lubuntu also.
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@MrRollton fix worked almost flawlessly apart from 1 (??) icon that still showed huge:
Applied the fix provided by @TuXFrk. Now even that icon is normal sized.
Kudos to both for providing these excellent solutions!!
Have just had to re-install because of hardware problems and have the same problem as RHHOEK in three of six e-mail accounts. When these enormous symbols (crowns and party balloons) appeared I thought that it had to do with the royal wedding!
It looks like a Thunderbird problem.
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Had same issue, fix from @tuXFrk worked great.
Thank you TuXFrk
sudo apt-get install fonts-symbola worked for me too
Cheers!
Worked for me too.
Thanks!
Tony.
Hi Wolfman,
I am having the same problem in Thunderbird since 18.04 was put on my machine about 3 days ago. It is not one set of emails it effects as I have had both ebay and facebook emails showing the large icons as well. I will upload print screens of what is happening on my screen. Once you get in the email itself the icons are also there.
Hi @Kushlamc,
did you check the solution at post #23?. 
Thank you! This solution worked for me too.
The same problem, huge icons, occurred in my Ubuntu 18.04 Thunderbird.
I solved it by reinstalling TB as suggested by RHHOEK , April 9th.
Thank you guys very much.
thanks, works a charm
worked for ubuntu 18.04 as well
Works like a charm… TKS!!
sudo apt-get install fonts-symbola works perfect in ubuntu MATE 18.04.1. Thanks @TuXFrk!
that’s it!!! same thing on Ubuntu 18.04