It often happens that you need to change the case of your text, e.g switch from a text written in uppercase to lowercase and vice-versa, all without having to retype the entire text. In this article we'll provide some simple but effective solutions, so read on.
Using the keyboard shortcut Shift + F3 (simultaneously pressing the two keys):
There are functions UPPER(), LOWER () and PROPER (), that can be used for this purpose.
You can use the Leet-Key add-on , it is compatible with several versions of Firefox or Thunderbird.