Sign up ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free.

Today Firefox started crashing whenever I'm trying to open the preferences editor, and also often during normal navigation. If I start Firefox from a terminal, when it crashes it returns the message: Attempting to load the system libmoon.

share|improve this question

2 Answers 2

up vote 3 down vote accepted

It seems you've run into an instance of this bug:

The workaround for now seems to be removing the moonlight browser plugin:

apt-get purge moonlight-plugin-core moonlight-plugin-mozilla
share|improve this answer

This is a common issue caused by Moonlight plugin. Uninstall moonlight-plugin-mozilla to solve your problem.

sudo apt-get purge moonlight-plugin-mozilla

If you still need Moonlight, then you could try the 3.0 preview version from:

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.