Firefox error: Permission denied to access property "target"

[vineetgopal]

Do you want to request a feature or report a bug?
Bug.

What is the current behavior?
Certain events in Firefox 54.0 trigger the following error:

Error: Permission denied to access property "target"
  at target(~/react/lib/getEventTarget.js:23:0)
  at getEventTarget(~/react/lib/ReactEventListener.js:58:0)
  at method(~/react/lib/Transaction.js:138:0)
  at transaction(~/react/lib/ReactDefaultBatchingStrategy.js:63:0)
  at batchingStrategy(~/react/lib/ReactUpdates.js:98:0)
  at ReactUpdates(~/react/lib/ReactEventListener.js:150:0)
  at func(~/raven-js/src/raven.js:265:0)

Note that raven is just wrapping the call, and I don't think that should be relevant.

The specific line of code this happens on is:

function getEventTarget(nativeEvent) {
  var target = nativeEvent.target || nativeEvent.srcElement || window;

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Property_access_denied suggests it could be due to an iframe and cross-origin issues. We do have some iframes embedded, although I haven't been able to reproduce the error.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template: https://jsfiddle.net/84v837e9/).
I was unfortunately not able to reproduce this, though it has happened for ~200 separate users since the Firefox 54.0 upgrade on June 13, 2017. If it helps, we reported a similar error a while ago to raven.js (getsentry/sentry-javascript#768) which was fixed using a try/catch.

What is the expected behavior?
No errors :)

Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?
React 15.3.2
Firefox 54.0, Windows and OSX

I think this is only an issue with the new Firefox, and not new behavior in React.

[Manuelandro]

getsentry/sentry-javascript#768

[aweary]

Without a reproduction, there's unfortunately not much we can do. Please feel free to ping me if you can provide a consistent repro with React. Thanks!

[StephanieYHe]

We're experiencing this problem too, and it's affecting users on Firefox 54, 55 and 56. No repro as well but just wanted to note that this issue continues!

[mqklin]

Same problem came in BugSnug to our production site.
Don't have an idea how to reproduce this.

[gaearon]

Let's keep this open for now. But we can't do anything without a repro case.

[robcmills]

We started seeing this same error in production on October 26:

Our stack trace points to an event listener on the window for unhandled rejections:

    window.addEventListener('unhandledrejection', (event) => {
        event.preventDefault()
        let error = _.get(event, 'detail.reason') || _.get(event, 'reason')

Which pretty much confirms what others have pointed out as the cause.

The information we gathered for this error:

• browser: Firefox 56.0
• os: Windows 7

We use React and Raven on the route in question but I don't know if they are related.
We are also unable to repro.
Hope this information helps?

[udivankin]

Same here with both Firefox v56 and v57.

Mozilla does split testing for some new security feature or just a very rare case?

[gaearon]

Doesn't seem like there's anything for us to do here.
I'll close again, but if it's our fault let us know.