Feedback widget not responsive to events within replay.io's browser (a firefox derivative)

[staticshock]

Is there an existing issue for this?

• [X] I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• [X] I have reviewed the documentation https://docs.sentry.io/
• [X] I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/browser

SDK Version

7.100.1

Framework Version

Next.js 14.1.0

Link to Sentry event

No response

SDK Setup

No response

Steps to Reproduce

1. Download the Replay.io browser, which is a gecko derivative (the specific version I'm on is macOS-gecko-20230919-abf2e86b2910-4d0a9f5b9de2 (64-bit), which is the latest available.)
2. Open up a site that has the feedback widget installed.
3. Open the feedback widget.
4. Attempt to submit it, or attempt to close it.

Expected Result

When I hit the "cancel" button within the widget, or when I click outside the widget, it should close. When I hit "submit", it should submit and close.

Actual Result

No error is shown in the console, and no network requests are issued. I debugged the onCancel event, and el.open = false; actually gets called on the dialog, but does nothing. I think they're using a version of firefox that's older than the build number would have you believe, since dialog's been fully supported in firefox since early 2022, but on their build the dialog element doesn't even have a close() method.