FWIW, any distribution which comes with a browser that doesn't do something like LibreJS suffers from the same problem (or worse): users will download and run proprietary software without even being aware of it just by going to their favorite web sites.
This is true, although programs delivered via non-free Javascript are so ubiquitous on the web and the demand for them so high the general practice seems to be just letting the user have this Javascript as it is expected behavior.
I know. But similarly, most users expect to be able to use their wifi/gpu card regardless of where the firmware is stored ("in hardware" or "in a blob").
Both are problems w.r.t computer freedom and ethics. But for some reason, most Free Software advocacy focuses on the "blob" part and turns a blind eye to the JS part.
Stefan