Add an option to restore the green background on the "Update available – download now"

[Aleksandra0056]

Is your feature request related to a problem?

The design of the green background on the "Update available – download now" item in the Applications menu was last seen in Firefox 88 and removed in the Firefox 89 Proton redesign.

The solution I'd like

Add an about:config option to restore the green background on the "Update available – download now" item in the applications menu.

The only problem would be, that the design would conflict with the green "up arrow" icon, but I think, that it could be solved by changing the colour of the mentioned icon. But as I recreated that behaviour this problem isn't in that case.

Screenshots or video

Original behaviour:

Current behaviour:

Alternatives I've considered

No response

Additional context

No response

[Aleksandra0056]

I recreated the original behaviour using Paint.net: