Hi. Did the -D option as suggested and added
export MOZILLA_FIVE_HOME=/usr/lib/xulrunner-1.9export LD_LIBRARY_PATH=$MOZILLA_FIVE_HOME:$LD_LIBRARY_PATH
to .bashrc. I now have a working eclipse that switches perspectives and shows a welcome screen without the SWT crashes. Woo!
However (you've guessed it), no run options for Tersus.
For best results, use the Firefox browser..