Why does ps -ef show four entries for chrome?

Wed Nov 22 15:44:17 MST 2017

top - 15:39:19 up 117 days,  6:18,  3 users,  load average: 0.52, 0.53, 0.40
Tasks: 254 total,   2 running, 252 sleeping,   0 stopped,   0 zombie
%Cpu(s):  4.5 us,  1.4 sy,  0.0 ni, 94.0 id,  0.1 wa,  0.0 hi,  0.0 si, 
0.0 st
KiB Mem:   8056428 total,  6113388 used,  1943040 free,   261496 buffers
KiB Swap:  1951740 total,  1479580 used,   472160 free.  2132628 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 1954 joe       20   0 4950656 262716  63456 S  22.5  3.3   8718:50
plasma-desktop
 1180 root      20   0  406848 142360  91556 S   2.0  1.8   1731:43 Xorg
 8319 joe       20   0 2536552  57272  40736 S   1.3  0.7   0:04.20 kwrite
 8265 joe       20   0 1523732 198328      0 S   0.7  2.5 204:22.04 chrome
 8385 joe       20   0  500772  39968  30976 S   0.7  0.5   0:00.32 konsole
 8411 joe       20   0   25068   3020   2412 R   0.7  0.0   0:00.10 top
 1947 joe       20   0 3271824 111492  13264 S   0.3  1.4 699:09.56 kwin
20472 joe       20   0 2773088   3460      0 S   0.3  0.0 342:53.07 chrome
23926 joe       20   0 1698316 146268      0 S   0.3  1.8 252:24.63 chrome
24818 joe       20   0 1681216 194792      0 S   0.3  2.4 205:45.48 chrome
26613 joe       20   0 1441312 305556   6452 S   0.3  3.8 117:09.59 chrome
    1 root      20   0   33920   3244   1800 S   0.0  0.0   0:10.59 init

== Also, why does "who" show 3 users when I am the only user logged on:
t420: who
joe      tty8         2017-07-28 09:20 (:0)
joe      pts/8        2017-07-28 09:20 (:0)
joe      pts/7        2017-11-22 15:42 (:0)