> Different apps on the same domain with the same mount point should see 
the same data.

That was my initial assumption but I've just double-checked and it isn't 
so. 

I have two separate (non-identical) apps generated with Emscripten: 
xyzzy.html and plugh.html in the same directory. Both have their own, 
distinct IDBFS contents. If I copy one of them to, say, plover.html (still 
in the same directory) and point Firefox at this copy, the copy no longer 
sees the file same file system as the original, but it sees a different 
file system, depending on whether it is a copy of xyzzy.html or of 
plugh.html.

If I swap the names of xyzzy.html and plugh.html, they both see distinct 
*new* file systems.

It looks like both the build name and the current name  that matter, at the 
very least. And I am fairly sure (though have no written notes to prove to 
myself that there were no other factors involved) that sometimes making a 
change to the C or JS code of an app, can cause it to lose sight of its 
IDBFS file system.

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