gecko-dev/testing/mochitest/mochitest-e10s-utils.js

// Utilities for running tests in an e10s environment.

function e10s_init() {
  // Listen for an 'oop-browser-crashed' event and log it so people analysing
  // test logs have a clue about what is going on.
  window.addEventListener(
    "oop-browser-crashed",
    event => {
      let uri = event.target.currentURI;
      Cu.reportError(
        "remote browser crashed while on " +
          (uri ? uri.spec : "<unknown>") +
          "\n"
      );
    },
    true
  );
}