IT

Windows

A good compilation of windows shortcuts
ALT + PrintScreen: only the active windows gets shot;

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Firefox

A overview of firefox shortcuts
Notes:
CTRL + T: open a new tab;
CTRL + SHIFT + T: re-open a closed tab;

LEFT_CLICK + CTRL: open a link in a new tab;
LEFT_CLICK + SHIFT: open a link in a new window;

SPACE BAR: scroll down;
SPACE BAR + SHIFT: scroll up;

CTRL + L: edit url;
CTRL + K: edit search box;

CTRL + R: reload;

CTRL + SHIFT + U: shows the source code;

Netbeans IDE

(Open Tools -> Options -> Keymap to control the shortcuts)
ALT + SHIFT + F: automatically indent the selected code or the entire file if none is selected;

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Web Developer Firefox Add-on 

(Open on Firefox: Tools -> Add-on/Extras -> Web Developer -> Options -> Shortcuts)
CTRL + SHIFT + A: opens a new tab with the HTML/XHTM (depending on the DOCTYPE used) W3C validation. Works for local files (localhost);