Many of us use facebook this way:
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Be in touch with people in tiny chat boxes at the bottom.
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Get sucked into the feed. It's placed right in the middle and is bottomless for a reason.
This extension sends you to the full-page messages instead of the default page. Simple as that. It has no effect once you're already on the site.
But this will save hours of your life.
Install Greasemonkey. Then click this link and confirm the installation.
Download this file, open the Tools > Extensions page, and drag the file onto the page.