Even on a phone/tablet, communication often includes web hyperlinks. The obsession with mobile is a reflection of business model. If you are in the advertising / surveillance capitalism business, mobile ("sensor phone") devices provide non-desktop signals that can be monetized.
Unfortunately, desktop software was hurt by piracy, with a few large ISVs making the most money. Today, Apple makes money on desktop hardware rather than desktop software. Microoft has tilted Windows 10 towards hosted services and data collection, but ISVs cannot abandon the large incumbent Win32 device market.
As laptop/desktop security improves, operating sytems could be reducing desktop software piracy and improving the profitability of ISVs. Instead, "app stores" are following two leaders who don't care about ISVs: Apple (hardware revenue, 30% ISV tax = tiny ISVs) and Google (data revenue, "free" apps).
We have the security technology and social network/marketing experience to design laptop/desktop software ecosystems that protect data/IP and support new ISVs. If Mozilla/Firefox wants to help, they can make it easier for web/extension developers and content creators to get paid.