The back button is a work in progress - it's not super simple to take a user back to the exact location they came from. That being said, we've been working on it and slowly improving it
Not sure why you mean by doesn't work for homesteading tag. Please post a screenshot
Search window is meant to do that. You search, close it when you find what you want and then can reopen it at any time to keep going
You can also drag to move that window around
Searching to find a homesteading post, then closing that window to vote the post, then opening and searching again for the next post, is not really usable IMO.
Moving the window only helps if the 'like' button is near bottom of screen.