Arch Linux

I have just noticed that when I tried to copy something to the clipboard in Firefox that I was unable to, although if I copy something from another application I am able to paste it into Firefox, but not able to copy within Firefox and then paste to Firefox or another applications, as far as I can see it fails to copy to the clipboard. I have tried restarting Firefox as well as my entire machine, but nothing seems to fix it. I have Firefox version 53.0.2-1 and GNOME 3.24.2 running on my up-to-date Arch system, I noticed this issue since about half an hour ago, this issue was not present yesterday, and half an hour ago was the first time today I tried to copy something to the clipboard in Firefox. Other applications seem completely unaffected by this issue.

The browser console sheds no light on the issue and neither does journalctl. I have attached a file containing the contents of my pacman.log for today as perhaps the issue is with something that got upgraded.