chunkwm recently added the ffm_disable_autoraise parameter, which works well on MacOS Mojave. To enable Focus Follows Mouse only, follow the installation steps, then edit ~/.chunkwmrcto comment out unwanted plugins and enable FFM.
chunkc core::load ffm.so
and disable auto-climb
chunkc set ffm_disable_autoraise 1
Other available plugins are useful, but not the subject of this question.
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