Bug#825668: Firefox memory reporting
Another clue that I have seen is that Firefox has been reporting a negative value for the heap-texture memory use. I don't know if this indicates a bug in Firefox's managing of that memory, it's reporting of that memory, or of Xorg's managing of that memory which is just being exposed by Firefox. I have noticed that Xorg's memory does grow even when Firefox is not running as shown in the idle logs in my original post. I haven't been able to keep the computer idle for more than a day to see how bad the problem gets in that situation.
3,530.59 MB (100.0%) -- explicit
├──2,136.22 MB (60.51%) -- window-objects
│ ├────958.44 MB (27.15%) ++ top(<anonymized-1851>, id=1851)
│ ├────673.34 MB (19.07%) ++ (429 tiny)
│ ├────177.67 MB (05.03%) ++ top(none)
│ ├────138.30 MB (03.92%) ++ top(<anonymized-3408>, id=3408)
│ ├─────97.81 MB (02.77%) ++ top(<anonymized-2247>, id=2247)
│ ├─────47.99 MB (01.36%) ++ top(<anonymized-2725>, id=2725)
│ └─────42.67 MB (01.21%) ++ top(<anonymized-728>, id=728)
├──1,862.17 MB (52.74%) ── heap-unclassified
├────494.26 MB (14.00%) ++ js-non-window
├─────96.45 MB (02.73%) ++ heap-overhead
├─────43.69 MB (01.24%) ++ xpconnect
└──-1,102.20 MB (-31.22%) -- (22 tiny) [?!]
├──────29.89 MB (00.85%) ++ workers
├──────27.46 MB (00.78%) ++ images
├──────22.72 MB (00.64%) ++ atom-tables
├──────20.70 MB (00.59%) ++ storage
├──────17.34 MB (00.49%) ++ media
├──────17.15 MB (00.49%) ++ add-ons
├──────12.33 MB (00.35%) ++ network
├───────7.98 MB (00.23%) ++ dom
├───────2.25 MB (00.06%) ++ cycle-collector
├───────1.79 MB (00.05%) ++ layout
├───────1.03 MB (00.03%) ── xpti-working-set
├───────0.72 MB (00.02%) ── cookie-service
├───────0.69 MB (00.02%) ── history-links-hashtable
├───────0.58 MB (00.02%) ── preferences
├───────0.51 MB (00.01%) ++ xpcom
├───────0.45 MB (00.01%) ── icu
├───────0.43 MB (00.01%) ++ webgl
├───────0.34 MB (00.01%) ── telemetry
├───────0.26 MB (00.01%) ++ startup-cache
├───────0.13 MB (00.00%) ── script-namespace-manager
├───────0.00 MB (00.00%) ── spell-check
└──-1,266.96 MB (-35.89%) -- gfx [?!]
├───────7.95 MB (00.23%) ── font-shaped-words
├───────0.42 MB (00.01%) ── font-tables
├───────0.26 MB (00.01%) ── font-cache
├───────0.09 MB (00.00%) ── font-list
├───────0.08 MB (00.00%) ── font-charmaps
└──-1,275.77 MB (-36.13%) ── heap-textures [?!]
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