[Bug] javascript: scheme is not handled inside Fenix

[makotom]

Steps to reproduce

1. Open https://makotom.net/tc-20190725.html .
2. Tap the text javascript:console.log('fired').

Expected behavior

Nothing noticeable should happen in any tab. (Observed behaviour in the conventional Firefox Mobile for Android.)

Actual behavior

A: In the case the page was opened in a normal tab, Chrome was opened upon tapping the text.
B: In the case the page was opened in a private tab, a prompt saying "Open in app? Your activity may no longer be priate." was shown.

Device information

• Android device: Pixel 3a, Build PQ3B.190705.003
• Fenix version:
  

Footnotes

• I recognize some relation between this issue and Handle Play Store links #1570 , because I see this issue reappeared aftter Handle Play Store links #1570 was fixed.
• I personally thought that this issue could be the root cause of Bookmarklets doesn't work from bookmarks #2871 - but this is just my guess.

┆Issue is synchronized with this Jira Task

[makotom]

I'm uploading the content of https://makotom.net/tc-20190725.html as tc-20190725.html.txt.

[bogas04]

Can face the issue on Amazon website.

Device: RealmeX
Operating System: ColorOS 6 based on Android Pie.
Browser: Nightly 190725 06:23 (Build #12060631) 📦: 6.0.0 🦎: 68.0-20190711090008

[makotom]

I recognize some relation between this issue and #1570 , because I see this issue reappeared aftter #1570 was fixed.

Maybe, the issue in interest should be #4114.

[johnsto]

Same issue here on build 1.1.0#12042112:

[johnsto]

Seems fixed in 1.2.0 (Build #12181645)!

[makotom]

This should have been fixed in mozilla-mobile/android-components@688d1f2 for mozilla-mobile/android-components#3944.

Can we close this issue for now?

[NotWoods]

Also could not reproduce on Nightly 191109.

[AndiAJ]

Hi, verified as fixed on the latest Nightly Build #13190606 from 11/15 using the following devices:
• Google Pixel 3a XL (Android 9)
• Huawei Mate 20 Lite (Android 8.1.0)
• Samsung Galaxy S7 (Android 7)
• OnePlus A3 (Android 6.0.1)
• LG Nexus 4 (Android 5.1.1)

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