Edit: I figured it out. The problem wasn’t permissions or Firefox itself, but my launcher. I’m using OLauncher, 'cause I rather like it’s text-lookup interface, but as it doesn’t make use of a traditional “home screen” Firefox won’t allow me to create an entry there.
Apparently, it’s a much-desired feature request
I think it may have been renamed to “Install” in previous versions, but neither appear anymore, and I don’t see any permissions denied so I’m assuming that can’t be it.



Weirdly, I do have a “special permissions” section in my phone (Fairphone 4, which basically runs stock Android 15), but there’s nothing about adding links to the homescreen in there, just:
I actually went through all of these, enabling Firefox’s permissions wherever it came up, but still nothing. I’m starting to think that this might be an Android (b)locking rather than a Firefox shortcoming.