Share on Facebook

When you put the mouse over a small version of a profile picture, a larger version will appear in the top left of the page (even if you are not friends with the person). The picture will stay there until you move the mouse over somebody else, or until you click the "x" by the larger picture.

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Customization

You can customize the script using about:config.

greasemonkey.scriptvals.http://userscripts.org/people/14536/FB Profile Pic.BigPicPosition

The above preference can be set to "left" to have the larger picture appear in the top left of the page, or "right" to have it appear in the top right.

greasemonkey.scriptvals.http://userscripts.org/people/14536/FB Profile Pic.BigPicAutoclose

The above preference can be set to "false" (default) to keep the larger version visible even when you take the mouse off the smaller one, or "true" to make it disappear when you take the mouse off the smaller one.

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This functionality, along with other features, is also include in my script Facebook Fixer. If you prefer you can install that script instead.