maintainer-feedback requested: [Bug 244879] Does www/firefox have a memory leak?

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Bug 244879: Does www/firefox have a memory leak?
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244879



--- Description ---
Firefox appears to be using an inordinate amount of RAM on 12.1-RELEASE-p2 with
the latest pkg repo enabled. Attached screenshot is RAM usage with 6 tabs open:
Reddit, GitHub, Resilio Sync Forums, Stack Exchange, Bugzilla, and Glances
documentation. Is this expected?