Index: www/chromium/Makefile
===================================================================
--- www/chromium/Makefile
+++ www/chromium/Makefile
@@ -300,6 +300,7 @@
 	${INSTALL_LIB} ${WRKSRC}/out/${BUILDTYPE}/swiftshader/${g} \
 		${STAGEDIR}${DATADIR}/swiftshader
 .endfor
+	${INSTALL_SCRIPT} ${FILESDIR}/fix-hanging-tabs.sh ${STAGEDIR}${DATADIR}
 
 post-install-DEBUG-on:
 	${INSTALL_LIB} ${WRKSRC}/out/${BUILDTYPE}/*.so \
Index: www/chromium/files/fix-hanging-tabs.sh
===================================================================
--- /dev/null
+++ www/chromium/files/fix-hanging-tabs.sh
@@ -0,0 +1,45 @@
+#! /bin/sh -
+#
+# Chromium has a known problem of hanging tabs.  The workaround for this
+# problem is to mount ~/.cache/chromium as memory-fs.  In order to do this,
+# before you run Chromium, please run this script as root once for each user
+# who uses Chromium.
+#
+# $FreeBSD$
+
+set -e
+
+# Make sure that the user specified both the user and the group.
+if [ ${#} -ne 2 ]; then
+	printf 'Usage: %s user group\n' "${0}" >&2
+	exit 1
+fi
+
+user="${1}"
+group="${2}"
+home="$(awk -F: -v user="${user}" '{if ($1==user) print $6}' /etc/passwd)"
+cachedir="${home}/.cache/chromium"
+fstabrecord="md ${cachedir} mfs rw,late,-w${user}:${group},-s300m 2 0"
+
+# Make sure that the provided user and group are valid.
+if ! id "${user}" >/dev/null 2>&1; then
+	printf 'Invalid user "%s"\n' "${user}" >&2
+	exit 1
+elif [ ! -d "${home}" ]; then
+	printf 'Cannot locate home directory of user "%s"\n' "${user}" >&2
+	exit 1
+elif ! grep "^${group}:" /etc/group >/dev/null; then
+	printf 'Invalid group "%s"\n' "${group}" >&2
+	exit 1
+fi
+
+if grep "${fstabrecord}" /etc/fstab >/dev/null; then
+	printf 'Workaround already configured for user "%s"\n' "${user}" >&2
+	exit 1
+fi
+
+if [ ! -d "${cachedir}" ]; then
+	su -l "${user}" -c 'mkdir "${cachedir}"'
+fi
+printf '%s\n' "${fstabrecord}" >> /etc/fstab
+mount "${cachedir}"
Index: www/chromium/pkg-message
===================================================================
--- www/chromium/pkg-message
+++ www/chromium/pkg-message
@@ -1,23 +1,21 @@
 --I--
 For correct operation, shared memory support has to be enabled
-in Chromium by performing the following command as root :
+in Chromium by performing the following command as root:
 
-# sysctl kern.ipc.shm_allow_removed=1
+    # sysctl kern.ipc.shm_allow_removed=1
 
 To preserve this setting across reboots, append the following
-to /etc/sysctl.conf :
+to /etc/sysctl.conf:
 
-kern.ipc.shm_allow_removed=1
+    kern.ipc.shm_allow_removed=1
 
-FreeBSD 11.0-R and newer have this set by default.
+FreeBSD 11.0-RELEASE and newer have this set by default.
 
 --II--
 Chromium has a known problem of hanging tabs. The workaround
 for this problem is to mount ~/.cache/chromium as memory-fs.
-In order to do this, before you run chromium, please run these
-commands once as root for each user who uses chromium (replace
-{user}/{group} with your user/group names):
-
-# [ -d ~{user}/.cache/chromium ] || mkdir ~{user}/.cache/chromium
-# echo "md $(echo ~{user})/.cache/chromium mfs rw,late,-w{user}:{group},-s300m 2 0" >> /etc/fstab
-# mount ~{user}/.cache/chromium
+In order to do this, before you run Chromium, please run the
+following script as root once for each user who uses Chromium
+(replace {user}/{group} with your user/group names):
+
+    # %%DATADIR%%/fix-hanging-tabs.sh {user} {group}
Index: www/chromium/pkg-plist
===================================================================
--- www/chromium/pkg-plist
+++ www/chromium/pkg-plist
@@ -3,6 +3,7 @@
 %%DATADIR%%/chrome-wrapper
 %%DATADIR%%/chrome_100_percent.pak
 %%DATADIR%%/chrome_200_percent.pak
+%%DATADIR%%/fix-hanging-tabs.sh
 %%DATADIR%%/font_service.service
 %%DATADIR%%/headless_lib.pak
 %%DATADIR%%/icudtl.dat