Download Status Bar?
Is there an extension that replicates Download Status Bar functionality of Chrome?
Similar to: https://addons.mozilla.org/en-US/firefox/addon/download-status-bar/
The downloads side panel takes quite a lot of space and shifts contents of the page, so it is inconvenient to use compared to a fairly narrow horizontal bar.
If you are willing to implement custom code for your browser, you can modify the sidepanel to overlap instead of resizing the width of the body. This way you could use the native downloads panel.