Firefox extension that writes to its own log file

After a whole day figuring out how to write something from my browser to a local text file.. Im thinking of something like for example a Firefox extension that has a log file.

Is there any way that my extension can write to my extension. Means, inside my extension got a log file.

For information I'm devel开发者_如何学Coping for Linux platform.

• General information on dealing with files in Mozilla code
• Code you can use for logging