Looks like you both have different problems (or at least the same one but different visible consequences :) and I am a little puzzled since I can't reproduce them. NVu works just fine here.
@Bump: is this a fresh install or an upgrade from a previous version?
@Sven: /usr/bin/nvu should use /usr/lib/nvu-1.0/run-mozilla.sh. Do you have MOZILLA_FIVE_HOME defined in your environment variables?
Looks like you both have different problems (or at least the same one but different visible consequences :) and I am a little puzzled since I can't reproduce them. NVu works just fine here.
@Bump: is this a fresh install or an upgrade from a previous version?
@Sven: /usr/bin/nvu should use /usr/lib/ nvu-1.0/ run-mozilla. sh. Do you have MOZILLA_FIVE_HOME defined in your environment variables?