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0e1f616
(Get the code!)
For the record, Firefox 61 very much does continue to make use of /proc/NNNN/smaps (and /proc/NNNN/statm) when using the about:memory page.
I confirmed this by experimentally commenting out the AppArmor rules for those two /proc files (motivated by comment #3 above), and subsequently observed AppArmor denials. However, the about:memory page still displayed the memory summary, and no error message came up at all.