Config Editor in Mozilla Thunderbird

Config Editor - Mozilla Thunderbird

o access the Config Editor, go to Tools > Options... (Thunderbird > Preferences... on Mac OS X, and Edit > Preferences... on Linux), select the Advanced options panel, click on the General tab, and click on Config Editor. This will display a list of used preferences, as well as a search bar at the top.

Double-click on a preference to change its value. To do add a new preference, open the context menu (right-click) on any existing preference, go to the New menu, and select the type of preference.

NOTE : Some preferences may require that you restart Thunderbird in order to take effect.