Post by BillyUsing Seamonkey only for newsgroups.
Use ProcMon and see what it is doing.
This version is for Vista or higher.
https://docs.microsoft.com/en-us/sysinternals/downloads/procmon
You need an older version for work on WinXP.
*******
You can check for ReadFile and WriteFile operations,
and see what files it is poking at.
It might be doing nothing, of course, and just
spinning in a CPU-limited circle. But with any
luck, there will be hints in the Seamonkey events
captured via ProcMon.
Paul