codeTabber is an Opera extension that brings panel-switching keyboard shortcuts to multiple online code editors. codeTabber allows you to switch focus between the various code panels using just the keyboard. The angle brackets, < and >, are used as facsimile arrow keys.
To move focus to the next pane, press CTRL and the greater-than key (>). To switch focus to the previous pane, press CTRL and the less-than key (<). If no pane has focus when a keyboard shortcut is used, focus will be given to the first pane. (Mac users: use CTRL rather than CMD.)
- Stack Overflow (code editor)