[firefox] Add profile sync daemon

It's really the bee's knees

config.yaml

@@ -278,6 +278,11 @@ dotfiles:
     src: ./pacman_hooks/
     dst: /etc/pacman.d/hooks/
 
+  profile_sync_daemon:
+    src: ./profile-sync-daemon/psd.conf
+    dst: ~/.config/psd/psd.conf
+    link: link
+
   prusa_slicer:
     dst: ~/.config/PrusaSlicer/
     src: ./PrusaSlicer/
@@ -499,6 +504,7 @@ profiles:
     - onedrive
     - openbox
     - openbox_theme
+    - profile_sync_daemon
     # - prusa_slicer
     - pycodestyle
     - pylint

profile-sync-daemon/psd.conf

@@ -0,0 +1,70 @@
+#
+# $XDG_CONFIG_HOME/psd/psd.conf
+#
+# For documentation, refer man 1 psd or to the wiki page
+# https://wiki.archlinux.org/index.php/Profile-sync-daemon
+
+## NOTE the following:
+## To protect data from corruption, in the event that you do make an edit while
+## psd is active, any changes made will be applied the next time you start psd.
+
+# Uncomment and set to "yes" to use overlayfs instead of a full copy to reduce
+# the memory costs and to improve sync/unsync operations. Note that your kernel
+# MUST have this module available in order to use this mode.
+#
+USE_OVERLAYFS="yes"
+
+# Uncomment and set to "yes" to resync on suspend to reduce potential data loss.
+# Note that your system MUST have gdbus from glib2 installed to use this mode.
+#
+#USE_SUSPSYNC="no"
+
+# List any browsers in the array below to have managed by psd. Useful if you do
+# not wish to have all possible browser profiles managed which is the default if
+# this array is left commented.
+#
+# Possible values:
+#  chromium
+#  chromium-dev
+#  conkeror.mozdev.org
+#  epiphany
+#  falkon
+#  firefox
+#  firefox-trunk
+#  google-chrome
+#  google-chrome-beta
+#  google-chrome-unstable
+#  heftig-aurora
+#  icecat
+#  inox
+#  luakit
+#  midori
+#  opera
+#  opera-beta
+#  opera-developer
+#  opera-legacy
+#  otter-browser
+#  qupzilla
+#  qutebrowser
+#  palemoon
+#  rekonq
+#  seamonkey
+#  surf
+#  vivaldi
+#  vivaldi-snapshot
+#
+BROWSERS=(firefox)
+
+# Uncomment and set to "no" to completely disable the crash recovery feature.
+#
+# The default is to create crash recovery backups if the system is ungracefully
+# powered-down due to a kernel panic, hitting the reset switch, battery going
+# dead, etc. Some users keep very diligent backups and don't care to have this
+# feature enabled.
+#USE_BACKUPS="yes"
+
+# Uncomment and set to an integer that is the maximum number of crash recovery
+# snapshots to keep (the oldest ones are deleted first).
+#
+# The default is to save the most recent 5 crash recovery snapshots.
+#BACKUP_LIMIT=5