Password autofill sometimes returns to Fenix home screen instead of the initiating page

[callahad]

I've seen this multiple times, but I can't reproduce it with perfect consistency. I'm sorry. Related to #87.

In my case, I'm using Bitwarden as a password manager.

Steps to reproduce

1. Open a private tab and navigate to a login page
   (I've only seen it happen on private pages, but possibly unnecessary.)
2. Tap the password field
3. Tap "Auto-fill with Bitwarden"
4. Find and select an appropriate entry
   (Note that this doesn't work entirely correctly; see https://bugzil.la/1538385)

Expected behavior

1. I'm returned to the originating page with my username and password filled in.

Actual behavior

1. I'm returned to Fenix's Private Mode home screen.
   Upon selecting my previously open tab, no information is filled in.

Device information

• Android device: Pixel (original)
• Fenix version: 1.0.1912 (Build #10811221 🦎 67.0a1-20190312095443)

┆Issue is synchronized with this Jira Task

[ekager]

Have you continued to see this issue?

[callahad]

No, I have not encountered this recently

…

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[ekager]

Okay, closing for now then please reopen if you see this again!