When I last tried it (around the time that article was posted, could've improved since), you needed to mess with gconf to enable the feature, which was for good reason because the compatibility was abysmal (ublock origin did not work and neither did dark reader or violentmonkey or really any extension I wanted to use).
Remember Firefox’s SSB that got removed before anyone knew about it since no one was using it, since it was behind a about:config flag, that users didn’t know about so they didn’t use it so Fx removed it? Weird-ass circular logic from Mozilla. I would have loved that PWA feature.
Nice, this could especially be important in the Linux Mobile space for things like https://windy.com and https://web.pulsepoint.org and the scanner radio and other similar websites
Nah, it is disconinued since many years, I thought it was kinda neat at first, but realized it would be faster to just use the full firefox browser instead.