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[BUG] Firefox: strange undefined toJSON property on JS objects #7015

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Description

Context:

  • Playwright Version: 1.12.1
  • Operating System: Windows
  • Node.js version: 14.6.1
  • Browser: Firefox

Describe the bug
After evaluating some custom code in the context of the page, some of JS objects receive strange toJSON property, which is undefined. Started to happen after upgrade to 1.12. And this happens on Firefox ONLY.

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