Rated 3 out of 5 stars

Do this at your own risk, and backup your data first.
1. xpi files are simply zipped packages usually containing an install manifest file and a java .jar code file.
2. Mozilla installation examines the install file. Open it from winzip, find the ... line and update it.
3. Take a deep breath and see if it still works. Fortunately, Java just ignores anything that's nonsense, so even if it doesn't work, it probably won't do any harm.

Rated 1 out of 5 stars

would had been really great to update it. I still don't understand why Thunderbird doesn't send emails automatically in background. To do this you have to combine Magic SLR and BlunderDelay...

Rated 5 out of 5 stars

Wonderful! It provides the real ability to send emails in background.

But why isn't it updated any longer?