Adding Webapps to installation package

I think it would be a good idea to include webapps in the installation package. After all, there are always situations where programs can only be used as a web solution (when they are not available for Linux).
Linux Mint offers this outofthebox:

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Uhmm..
Web browsers have had this feature for 5+ years out of the box.

Firefox seems to have lately restricted it only for PWA sites?
They recommend some funny workaround which obviously is useless:

I'd suggest considering if Brave browser could replace Firefox by default, it has the feature among others.