687 tabs, counted by Tab Tally 1.2.0, one of which was pinned. Nothing contained, everything in Default.
In eleven of twelve windows, the count presented by Sea Containers 0.5 matched the count presented by Clear Tabs 1.0.5.1.
In the window with the one pinned tab, the count presented by Sea Containers appeared to be one short (98) of the 99 presented, top right, by Clear Tabs:
[grahamperrin@momh167-gjp4-hpelitebook8570p-freebsd] ~% date ; uname -v
Thu 7 Sep 2017 04:52:37 BST
FreeBSD 12.0-CURRENT #0 r320869: Mon Jul 10 13:57:55 UTC 2017 root@releng3.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
[grahamperrin@momh167-gjp4-hpelitebook8570p-freebsd] ~% pkg info firefox | grep -i version
Version : 55.0.3_1,1
[grahamperrin@momh167-gjp4-hpelitebook8570p-freebsd] ~%
687 tabs, counted by Tab Tally 1.2.0, one of which was pinned. Nothing contained, everything in Default.
In eleven of twelve windows, the count presented by Sea Containers 0.5 matched the count presented by Clear Tabs 1.0.5.1.
In the window with the one pinned tab, the count presented by Sea Containers appeared to be one short (98) of the 99 presented, top right, by Clear Tabs: