what does VIRT 3736704 firefox mean?  with only 63688 swap used, and only
2g ram available, where exactly would firefox have that 3.7g?  does that
perchance include nearly 2g of memory "requested but not allocated" or
something like that?

top - 17:52:35 up 10:29,  5 users,  load average: 0.21, 0.18, 0.23
> Tasks: 164 total,   1 running, 163 sleeping,   0 stopped,   0 zombie
> %Cpu0  :  3.3 us,  0.3 sy,  0.0 ni, 96.3 id,  0.0 wa,  0.0 hi,  0.0 si,
> 0.0 st
> %Cpu1  :  3.7 us,  0.3 sy,  0.0 ni, 96.0 id,  0.0 wa,  0.0 hi,  0.0 si,
> 0.0 st
> KiB Mem :  2003420 total,   119212 free,  1431256 used,   452952 buff/cache
> KiB Swap:  1953120 total,  1889432 free,    63688 used.   320280 avail Mem
>
>   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
>  1339 g         20   0 3736704 1.379g 116880 S   6.0 72.2  95:50.84 firefox
>   863 root      20   0  306200  79544  68220 S   0.3  4.0   4:31.55 Xorg
>  1521 g          9 -11  488056   6768   4472 S   0.3  0.3   3:27.73
> pulseaudio
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