Locale Switcher extension provides simple way to switch between languages through a menu.
The default UI for Thunderbird does not provide an easy way to switch between multiple installed language packs for the application, because ordinary users aren't expected to install multiple language packs.
However, some developers or users who speak multiple languages may wish to install language packs and easily switch between multiple languages.
The extension adds a "Languages" item on the "Tools" menu under the existing Extensions/Themes options, allowing the user can select a language.
Here are some key features of "Locale Switcher":
· Provides a convenient menu item to switch between installed languages.
· Mozilla Firefox