Sorry, I went to work, just got home and tried this.
With version 0.7.2, I got the same error, and also saw in Javascript console:

Error: Permission denied to create wrapper for object of class UnnamedClass

The best is, the_glu's fix works!! I am able to send emails with signature.asc now. You're so fast, thank you so much!

Hi, thank you for the quick reply!!
I will try it and get back smile

Hi, I am new to FireGPG and using version 0.7 with Firefox 3.0.5.

I want to be able to sign my email, without encrypt. I am able to do inline sign by clicking both the "Sign" and "Inline" icon. When doing this, when I click 'Send' I am asked for private-key passphrase, and it works.

However if I only click the "Sign" icon, nothing seems to happen .. I am not asked for passphrase and the received email has no inline or attached signature. Is it possible to use FireGPG to attach the signature like signature.asc?

Thank you for producing this software!!