Not an answer to your question, but this extension has caused Mozilla to come out and say they're working on integrating PWAs into Firefox base. Maybe we're in an awkward in between phase?
this post was submitted on 18 Jun 2025
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Oh ok that makes more sense. Thank you
What's confusing here is that MDN content is not solely written by Mozilla - see e.g. @[email protected]. So it's probably not Mozilla saying you need to install this extension.