For anyone that has to wait for their distro package manager before they get this update, here is a workaround for the most annoying bug (losing the ability to drag/re-order tabs in Firefox):
If the bug is present, you will find that drag-and-drop functionality has seized working in Firefox and it is not possible to select and drag drop images, texts, URLs, tabs etc.
4 Either restart Firefox or do the following to restore drag-and-drop functionality:
a Open another application like a text editor.
b Enter some random text, select it en drag it unto the URL-bar area in Firefox.
This will cause Firefox to try and open the selected text as if it were a URL.
c After this, try step 1 again to see if drag-and-drop functionality has returned.
For anyone that has to wait for their distro package manager before they get this update, here is a workaround for the most annoying bug (losing the ability to drag/re-order tabs in Firefox):