JS Deminifier is an open source add-on designed to work with Mozilla Firefox 4.0 Beta 7 or later, Firefox for Mobile 4.0 Beta 3 Pre - 4.0 Beta 3 Pre and Mozilla Thunderbird 3.0 Beta 3 - 3.2 Alpha 1 Pre.
This add-on doesn't require you to restart the web browser.
How to Install in Thunderbird:
1. Right-click the link below and choose "Save Link As..." to download and save the file to your hard disk.
2. In Mozilla Thunderbird, open Add-ons from the Tools menu.
3. Click the Install button, and locate/select the file you downloaded and click "OK".
· Mozilla Thunderbird