Chrome and Firefox
“CTRL+SHIFT+T” opens up your last closed tab.
Use “Cmnd + Shift + T” on a Mac.
Press “CTRL+ENTER to add .com to ant word you type in the URL bar. Pressing “shift” produces .net and “shift/ctrl” is .org. Works on Chrome/Firefox/Opera.
Hold down “CTRL” when clicking a link brings to option to open in a new tab.
Mac keyboard shortcuts here: