FF freezing on simple edits in film entries

I'm cleaning up some items in which I mistakenly entered the director's first and last name into the single box rather than separating them.

Clicking on the dual box ("switch to two fields") will put them right (rather than having to delete and enter the names again), but FF first began to hang for up to a minute during this process and now it's beginning to freeze up altogether, requiring force quit, no matter what sort of change I try to make to "director." This doesn't seem to be happening on any other entry type, or indeed any other field edit in film entries, and it's happening on both my machines.

Zotero isn't reporting an error, either.

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