Reproducible with the following page:
<!DOCTYPE html>
<html>
<body>
<button>Hello</button>
<math xmlns="http://www.w3.org/1998/Math/MathML"><semantics></semantics></math>
</body>
</html>
Clicking the Hello button crashes the browser extension.
Using Chrome Version 96.0.4664.45 (Official Build) (64-bit)
1Password Version: Not Provided
Extension Version: 2.1.4 (Chrome)
OS Version: Ubuntu 21.04