A specific example, clicking on My Watchlist will produce the spinning "Loading" object, but it'll stay there forever and never complete the action.

Going to Safari browser and doing the same thing works fine.

Just lately I've experienced several anomalous behaviors w/ Zoho when using Firefox.

Naturally, I have done the due diligence of rebooting, etc.  I think it's a newly introduced incompatibility w Firefox.  I've made no changes to Firefox during this time.