same way as the Firefox browser.
In Firefox, if you want to change advanced configuration settings, you
can get to this page, by typing in about:config into the address bar.
So how do you do that in Thunderbird which has no 'address bar' ?
Some research on Google found me the answer:
Thunderbird's about:config can be reached by navigating as follows.
1. Open Thunderbird,
2. Goto Tools>Options>Advanced>General
3. At the bottom of this tab, is an entry that says "Advanced
Configuration" and has a button to the right called "Config Editor".
4. Click on Config Editor to launch the Thunderbird editon of about:config
