htop, sorted by RES, http://logs.glob.uno/?c=firefox#c450936

  1  [||||||||||||||||||                                                 23.4%]   Tasks: 128, 0 thr, 35 kthr; 2 running
  2  [||||||||||                                                         12.5%]   Load average: 1.08 1.15 1.01
  3  [||||||||||                                                         12.5%]   Uptime: 14:27:07
  4  [||||||||||||                                                       14.6%]
  Mem[|||||||||||||||||||||||||||||||||||||||||||||                6.11G/15.9G]
  Swp[||                                                            130M/8.00G]

S   PID USER      PRI  NI  VIRT   RES S CPU% MEM%   TIME+  Command
S  3871 grahamper  25   0 5031M 3726M S 27.5 22.9  1h18:11 firefox
S  3917 grahamper  28   0 8476M 2143M S 13.7 13.2 44:42.14 seamonkey
S  1556 grahamper  20   0  973M  737M S  0.0  4.5  9:22.63 kwin_x11 -session 10371316366313000150183356200000015950043_1505017126_279340
S  3843 grahamper  20   0 1678M  506M S  0.2  3.1  7:26.33 thunderbird
S  1560 grahamper  20   0  580M  234M S  0.1  1.4 29:14.97 plasmashell
S  1557 grahamper  39  19  256G  233M S  0.0  1.4  0:11.49 baloo_file
S  1351 root       20   0  306M  232M S  1.3  1.4 23:49.75 X -nolisten tcp -auth /var/run/sddm/{4ef81608-8032-49b3-87fc-83a227a91ed9} -background none -noreset -disp
S  3592 grahamper  20   0  132M  105M S  0.0  0.7  0:43.94 geany
S  3083 grahamper  20   0  256G  103M S  0.0  0.6  0:58.02 dolphin
S  2224 grahamper  20   0  267M   98M S  0.0  0.6  0:06.30 systemsettings5
S  1791 grahamper  20   0  196M 82668 S  0.0  0.5  1:34.35 konsole
S  1757 grahamper  20   0  299M 77664 S  0.0  0.5  0:04.01 akonadi_mailfilter_agent --identifier akonadi_mailfilter_agent
S  1752 grahamper  20   0  293M 75668 S  0.0  0.5  0:04.06 akonadi_archivemail_agent --identifier akonadi_archivemail_agent
S  1578 grahamper  20   0  294M 75184 S  0.0  0.5  0:03.82 korgac -session 10371316366313000150489796700000015050008_1505017041_427302
S  1765 grahamper  20   0  289M 75176 S  0.0  0.5  0:05.67 akonadi_sendlater_agent --identifier akonadi_sendlater_agent
S  1763 grahamper  20   0  274M 74396 S  0.0  0.4  0:03.00 akonadi_newmailnotifier_agent --identifier akonadi_newmailnotifier_agent
S  1558 grahamper  20   0  224M 74320 S  0.0  0.4  1:35.26 krunner
S  1738 grahamper  20   0  348M 73088 S  0.0  0.4  0:07.10 mysqld --defaults-file=/home/grahamperrin/.local/share/akonadi/mysql.conf --datadir=/home/grahamperrin/.lo
S  1650 grahamper  20   0  177M 69368 S  0.0  0.4  0:03.48 python2.7 /usr/local/bin/hp-systray -x
S  1573 grahamper  20   0  189M 66412 S  0.0  0.4  0:09.90 kmix -session 10371316366313000149970170300000014500008_1505017041_443668
S  1652 grahamper  20   0  130M 43468 S  0.0  0.3  0:02.53 sysadm-client
S  1764 grahamper  20   0  134M 43080 S  0.0  0.3  0:05.05 akonadi_notes_agent --identifier akonadi_notes_agent
S  1733 grahamper  20   0  144M 41568 S  0.0  0.2  0:00.91 akonadiserver
S  1754 grahamper  39  19  126M 39648 S  0.0  0.2  0:02.47 akonadi_indexing_agent --identifier akonadi_indexing_agent
S  1753 grahamper  20   0  125M 38616 S  0.0  0.2  0:05.03 akonadi_followupreminder_agent --identifier akonadi_followupreminder_agent
S  1756 grahamper  20   0  121M 38384 S  0.0  0.2  0:05.01 akonadi_maildispatcher_agent --identifier akonadi_maildispatcher_agent
S  1755 grahamper  20   0  120M 37976 S  0.0  0.2  0:02.54 akonadi_maildir_resource --identifier akonadi_maildir_resource_0
S  1585 grahamper  20   0  128M 37772 S  0.0  0.2  0:04.70 kactivitymanagerd start-daemon
S  1790 grahamper  20   0  110M 37752 S  0.0  0.2  0:02.42 kuiserver5
S  1760 grahamper  20   0  117M 37532 S  0.0  0.2  0:02.42 akonadi_migration_agent --identifier akonadi_migration_agent
S  4411 grahamper  20   0 75440 36836 S  0.0  0.2  0:02.36 hexchat --existing
S  1540 grahamper  20   0  119M 35648 S  0.0  0.2  0:04.71 ksmserver
S  1561 grahamper  20   0  117M 34452 S  0.0  0.2  0:02.48 polkit-kde-authentication-agent-1
S  1731 grahamper  20   0  102M 31460 S  0.0  0.2  0:03.77 akonadi_control
S  1532 grahamper  20   0  113M 31164 S  0.0  0.2  0:02.51 kaccess
…