Occasionally we are seeing a crash in the Settings page JS:

"Uncaught (in promise) RangeError: Too many arguments in function call  (only 65534 allowed)
    at crisper.js:486
    at Array.map (<anonymous>)
    at Object.ConvertImageSequenceToPng (crosper.js:486)
    at HTMLElement.handleProfileInfo_ (crisper.js:597)

I suspect this is preventing the page from responding to events (e.g. network updates).

See issue 897916 for details