by Fibro Jedi on WordPress.org
Your own tab for Classic Editor containing the preview/publish buttons. As you use the editor, it scrolls with you. No more scrolling back to the top!

FJ-SPPB on an already-published page or post: Just the preview and update buttons.
Stop scrolling back up to the Publishing buttons on large screens! Or stop having to scroll down a long way on smaller screens!
Take advantage of a Preview and Publish/Update Button in post editor that scrolls down the screen as you scroll, saving you time and annoyance.
Customise your tab to work your way, and even decide how the buttons function.