As much as it may seem handy to keep many windows open in your screen, ready to work with, they are more likely to become a focus trap. Instead, have a super easy super quick way to open whatever you want in a blink and keep fewer windows and tabs open.
Get familiar with a good desktop searching tool (spotlight, google desktop, ...).
Practice the shortcuts to close windows (Mac: Cmd+W / PC: Alt+F4).
Start from zero more often. Use "shut down" instead of "sleep". Make todo-lists instead of "window-collections". Be in charge - don't let a tab decide what you'll be doing next, just because it's there. Apply to paper documents on your desk and other similar stuff.
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