Browser Support • Protonmail overloading Pale Moon and the system

Operating system : PCLinuxOS-Debian Edition Browser version : 34.3.0.1 (Linux GTK2) 32-bit or 64-bit browser? : 64-bit Problem URL : Protonmail once logged in

Starting today, Protonmail borks Pale Moon and the whole system slows to a crawl. While the login page loads fine, the mess starts once logged in. I can't report it to them because the page never loads properly, and I have to kill the Pale Moon process. Can someone who uses Protonmail check it out? It loads fine in Chromium, but I want to see if any other Pale Moon user has the same problem before I report it to them.