Fenix: FNX2-16172 ⁃ [Bug]Reader mode not working on Beta 5.1.0-beta.1

[AndiAJ]

Steps to reproduce

1. Navigate to https://en.m.wikipedia.org/wiki/Main_Page
2. Tap and open the ⋮ Main menu
3. Enable Reader Mode

Expected behavior

The website should be reloaded in Reader mode

Actual behavior

Nothing happens

Device information

• Android device:
  • Google Pixel 3a (Android 10)
  • Huawei Mate 20 Lite (Android 9)
  • OnePlus A3 (Android 6.0.1)
• Fenix version: Beta 5.1.0-beta.1

Notes

:heavy_check_mark: Works on the latest Nightly 200520 from 5/20
❗ Checked other websites, but still Reader mode doesn't work

► Video

[csadilek]

The cause of this is that latest reader mode is using Promise.any which is not supported yet on beta :(. This needs a workaround in A-C.

TypeError: "Promise.any is not a function"
    showAsync moz-extension://386529cf-6dd2-48ea-9e76-b00dcbd20437/readerview.js:340
    connectNativePort moz-extension://386529cf-6dd2-48ea-9e76-b00dcbd20437/readerview.js:350
readerview.js:343:21

[csadilek]

Fix landed in A-C and will be available in next beta build.

[softvision-miralobontiu]

Verified as fixed on the latest Beta 5.1.0-beta.2 build, and on 5/27 Nightly build with Samsung Galaxy Note 8 (Android 9), Samsung Galaxy Tab A6 (Android 5.1.1), Google Pixel (Android 10), and Sony Xperia Z5 Premium (Android 7.1.1).