Custom app share icon is huge in Feedly custom tab

[ekager]

Steps to reproduce

Have Fenix as default browser. Open links in Feedly using in-app Fenix tab. When you opened the link. In Feedly settings make sure "Preferred Browser" is set to "Built-in" which causes it to use custom tabs. Then simply tap on an article, then tap on the article title which will open it in the custom tab.

Expected behavior

It should have a normal-looking Share button outside the 3-dot menu

Actual behavior

When using Feedly there is a super-weird share button left to 3-dot menu button and it works. (Ignore image on right)

Device information

• Android device: Samsung, Android 7.0
• Fenix version: 1.4.1

Modified from: mozilla-mobile/fenix#5330

┆Issue is synchronized with this Jira Task

[NotWoods]

The large share button is probably a custom action button set by Feedly. We may not parse it properly. See CustomTabActionButtonConfig.

[ekager]

A user just reported in mozilla-mobile/fenix#7948 that this share icon does not work.

[NotWoods]

Couldn't reproduce mozilla-mobile/fenix#7948