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Email this page (by Google)
Email this page is another of those must-have-it extensions. I am regularly sending Web page links to various members of the teams I'm involved with, and this is a surprisingly big time-saver over cutting and pasting the link. The real value, though, is I can select a chunk of text, tap the toolbar button, and have that text show up in the body of the message.
How often used: Daily, throughout the day.
Live without it factor: I could live without it, but since a similar function exists on Firefox, I'd probably have stayed with Firefox if this wasn't available in Chrome.