In Firefox, it's possible to rearrange tabs (reordering, moving to a new window, etc.) by drag-and-drop. But drag-and-drop is slow and unwieldy, and is difficult for some people to use.
In Chromium/Chrome, it's possible to reorder tabs using the keyboard shortcuts Ctrl-Shift-PgUp/Ctrl-Shift-PgDn (see also https://chrome.google.com/webstore/detail/moigagbiaanpboaflikhdhgdfiifdodd).
How can one reorder tabs using the keyboard in Firefox? What about moving tabs between windows?