Crash upon loading navigation menu on Amazon.com

[cvan]

Hardware

Oculus Go
dcb38f3

Steps to Reproduce

1. Launch https://amazon.com/.
2. Press the Navigation in the top-left corner (i.e., the hamburger menu icon).
3. Notice Firefox Reality crashes. (See crash report on Socorro.)

Current Behavior

Firefox Reality crashes upon loading JavaScript: (0). (See crash report on Socorro for java.net.URISyntaxException: at java.net.URI$Parser.fail(URI.java).)

Expected Behavior

Firefox Reality does not crash upon loading JavaScript: (0).

Context

Firefox Reality chokes on the URI, JavaScript: (0), when it is parsed by the URL parsing logic in the UI-Override code (added in PR #777).

Logs

See crash report on Socorro.
Callstack:

java.net.URISyntaxException
	at java.net.URI$Parser.fail(URI.java:2856)
	at java.net.URI$Parser.checkChars(URI.java:3029)
	at java.net.URI$Parser.parse(URI.java:3066)
	at java.net.URI.<init>(URI.java:590)
	at java.net.URI.create(URI.java:852)
	at org.mozilla.vrbrowser.browser.UserAgentOverride.lookupOverride(UserAgentOverride.java:46)
	at org.mozilla.vrbrowser.browser.SessionStore.onLoadRequest(SessionStore.java:949)
	at org.mozilla.geckoview.GeckoSession$3.handleMessage(GeckoSession.java:452)
	at org.mozilla.geckoview.GeckoSession$3.handleMessage(GeckoSession.java:402)
	at org.mozilla.geckoview.GeckoSessionHandler.handleMessage(GeckoSessionHandler.java:79)
	at org.mozilla.gecko.EventDispatcher$3.run(EventDispatcher.java:356)
	at android.os.Handler.handleCallback(Handler.java:751)
	at android.os.Handler.dispatchMessage(Handler.java:95)
	at android.os.Looper.loop(Looper.java:154)
	at android.app.ActivityThread.main(ActivityThread.java:6143)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)

[bluemarvin]

@cvan were you logged into amazon? I can't reproduce the crash.

[cvan]

@cvan were you logged into amazon? I can't reproduce the crash.

nope, on a clean install.

you can reproduce by clicking the last link on https://webxr.sh/javascript-url

[bluemarvin]

Thanks, was able to reproduce crash and verified my PR fixes the issue.