Technically this one isn't an extension, it's actually a Bookmarklet.
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Perhaps also grab this nifty browser Bookmarklet, Wirify which enables you to see a"wireframe-d" version of any live site.
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Shared Stuff- web page sharing system, incorporating a Bookmarklet to share pages, and a page to view the most popular shared items.
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The great thing about the Bookmarklet is that it allows you to share with different groups or individuals,
embed images, and publish it to Twitter.
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One thing that I like about FiveFilters is that it comes with a Bookmarklet(drag the link to your browser's toolbar to use it)
where you can easily drag a partial feed to your browser toolbar and get it to churn out the full content feed.