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CSSViewer is another very helpful tool for Web development. Once you tap the toolbar button, it gives you a floating window with the CSS properties of anything you hover over. Love it!
How often used: I use this in spurts, when I'm doing Web development. Since that's not my full-time gig, it means I can go a month or more without using this.
Live without it factor: However, when I am doing Web development, this is very helpful and I couldn't live without it.
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.
Evernote Web Clipper
Because I do so much research and writing, I like to keep clips of Web pages and articles I find. In the process of researching my most recent two books, I've clipped thousands of pages. I used to use a tool called Zotero, but found it cumbersome. When I moved to Chrome, I bought a premium license to Evernote and now I use the Evernote Web Clipper constantly.
How often used: Daily, during my morning reading, and then sporadically throughout my day.
Live without it factor: I rely heavily on searchable archives of Web pages, so for me, it's invaluable. I've had some problems with it (it likes to capture multiple copies of a page), and searching isn't as granular as Google, but even so, it's proven to be a must-have extension.