There is no option for this plugin to only set for posts, it messed up our pages adding featured images in all our pages and have to review the whole site again.
Beware: once you activate this, you're stuck with it forever. Deactivating and deleting the plug-in won't do you any good. I activated this and now the main image on each blog post has been duplicated right at the top, full size. It looks ridiculous.
I just ran this on our blog and it made the large body images inside our posts the featured image, on 89 of our posts. No thumbnails are created or used. The plugin will not undo this so I'm manually editing 89 posts to uncheck the featured image.
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