Seems that disabling Missing e has restored normalcy to my Tumblr Dash, where before it was freezing and crashing the tab. I assume this is a Tumblr problem, not a Missing e problem.
And by normalcy, I don’t just mean that I can now access Tumblr without the damn site crashing, but that my Dash is now back to the state it was in before I installed Missing e. Hadn’t realised quite how many features I’d come to rely on aren’t actually Tumblr’s.
It’s amazing how one guy could make this site infinitely more usable.