about:Config Extension

In previous Reloadchromezilla-related posts the process to add the nglayout.debug.disable_xul_cache preference is a little laborious -- it turns out that you can just download the about:config extension for Thunderbird! You can read more about the about:config extension here. It's a great extension, and from my experience, worked a lot better than the preferential extension (which consistently crashed Thunderbird while building a tree of preferences)