I just tested 2.49.1 with 10.13 and it generally seems to work. But there are several issues now reported against Firefox and if you really don't need to I would wait with upgrading:
https://bugzilla.mozilla.org/buglist.cg ... arch=10.13
I can at least reproduce Bug 1390125 which seems to be an apple Issue:
https://bugzilla.mozilla.org/show_bug.cgi?id=1390125
FRG
SeaMonkey and macOS 10.13
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Re: SeaMonkey and macOS 10.13
Meaning "upgrading Mac OSX" rather than SeaMonkey, I'd assume (also keeping in mind that 2.49.1 is in the works but hasn't been released yet ).