If you’re anything like me, when writing long WordPress posts, you constantly press Save and Continue Editing so you can see the preview which appears below the editing area in the WP dashboard. It’s really nice to be able to see what the post will really look like when done, but the frame it’s put in is a bit small.
If you want a full browser window sized preview, then (in Firefox) right-click inside the frame and do This Frame > Open Frame in New Tab. Now, everytime you click that button, you can head over to this tab and reload it for a real-sized preview of what your post is going to look like when done.
I find it useful, anyway…