diff --git a/actions.toml b/actions.toml
new file mode 100644
index 0000000..0cc4fec
--- /dev/null
+++ b/actions.toml
@@ -0,0 +1,10 @@
+[install_extensions]
+name = "Install Extensions"
+description = "Intall Standard Notes - Extensions"
+command = "/bin/bash actions/install_extensions"
+cwd = "/etc/yunohost/apps/$app/scripts"
+
+[remove_extensions]
+name = "Remove Extensions"
+description = "Remove Standard Notes - Extensions"
+command = "/bin/bash scripts/actions/remove_extensions"
diff --git a/check_process b/check_process
index c8dd4a8..12e1e89 100644
--- a/check_process
+++ b/check_process
@@ -5,9 +5,9 @@
 
 ;; Test complet
     ; Manifest
-        domain="domain.tld"	(DOMAIN)
-        path="/path"	(PATH)
-        is_public=1	(PUBLIC|public=1|private=0)
+        domain="domain.tld"    (DOMAIN)
+        path="/path"    (PATH)
+        is_public=1    (PUBLIC|public=1|private=0)
         install_extensions=1
         access_domain="/"
     ; Checks
@@ -19,7 +19,7 @@
         setup_public=1
         upgrade=1
         # 3.13.6~ynh1
-        upgrade=1	from_commit=7474baadc1705ffe5981a52bdced16bdd1edf979
+        upgrade=1    from_commit=7474baadc1705ffe5981a52bdced16bdd1edf979
         backup_restore=1
         multi_instance=1
         # This test is no longer necessary since the version 2.7 (PR: https://github.com/YunoHost/yunohost/pull/304), you can still do it if your app could be installed with this version.
diff --git a/conf/message b/conf/message
index 8b5460d..d8a5625 100644
--- a/conf/message
+++ b/conf/message
@@ -1,4 +1,4 @@
-Standard Notes - syncing server was successfully __TYPE__.
+Standard Notes - Syncing Server was successfully __TYPE__.
 Please configure the Standard Notes web app or mobile app to use this syninc server: https://__DOMAIN____PATH_URL__/
-__CONFIG_PANEL__
+__ACTION__
 __EXTENSIONS__
diff --git a/manifest.json b/manifest.json
index ef4c8c5..0317793 100644
--- a/manifest.json
+++ b/manifest.json
@@ -74,7 +74,7 @@
                 "ask": {
                     "en": "Choose a domain which has access to the extensions. E.g. the Standard-Notes web app."
                 },
-				"optional": true,
+                "optional": true,
                 "example": "example.tld",
                 "default": ""
             }
diff --git a/scripts/actions/install_extensions b/scripts/actions/install_extensions
new file mode 100644
index 0000000..b512451
--- /dev/null
+++ b/scripts/actions/install_extensions
@@ -0,0 +1,94 @@
+#!/bin/bash
+
+#=================================================
+# GENERIC STARTING
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source /usr/share/yunohost/helpers
+
+#=================================================
+# MANAGE SCRIPT FAILURE
+#=================================================
+
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
+#=================================================
+# RETRIEVE ARGUMENTS
+#=================================================
+
+app=$YNH_APP_INSTANCE_NAME
+path_url=$(ynh_app_setting_get --app=$app --key=path)
+domain=$(ynh_app_setting_get --app=$app --key=domain)
+
+#=================================================
+# CHECK IF ARGUMENTS ARE CORRECT
+#=================================================
+
+final_path=/opt/yunohost/$app
+config_file="$final_path/live/.env"
+
+if [[ ! -f $config_file || \
+      ! -d "$final_path/live/public/extensions/" || \
+      ! -d "$final_path/live/public/extensions/src/" ]]
+then
+    ynh_die --message="Standard Notes - Extensions can not be installed." --ret_code=1
+fi
+
+#=================================================
+# CHECK IF AN ACTION HAS TO BE DONE
+#=================================================
+
+install_extensions_old=$(ynh_app_setting_get --app=$app --key=install_extensions)
+
+if [ $install_extensions_old -eq 1 ]
+then
+    ynh_die --message="Standard Notes - Extensions should alredy be installed." --ret_code=0
+fi
+
+#=================================================
+# SPECIFIC ACTION
+#=================================================
+# MOVE TO PUBLIC OR PRIVATE
+#=================================================
+
+ynh_script_progression --message="Installing Standard Notes - Extensions ..." --weight=5
+
+ynh_replace_string --match_string="^RAILS_SERVE_STATIC_FILES=.*$" --replace_string="RAILS_SERVE_STATIC_FILES=true" --target_file="$config_file"
+
+if [ "$path_url" = "/" ]
+then
+    path=""
+else
+    path=$path_url
+fi
+
+find "$final_path/live/public/extensions/src/" -name "*.json" -print0 | while read -d $'\0' file
+do
+    ynh_replace_string --match_string="__DOMAIN__PATH__" --replace_string="$domain$path" --target_file="$file"
+done
+
+find "../conf/" -name "ext_*.src" -print0 | while read -d $'\0' file
+do
+    basename=$(basename -as .src $file)
+    ynh_setup_source  --dest_dir="$final_path/live/public/extensions/src/${basename#'ext_'}" --source_id="$basename"
+    ynh_secure_remove --file="$basename.zip"
+done
+
+# Update the config of the app
+ynh_app_setting_set --app=$app --key=install_extensions --value="1"
+
+#=================================================
+# RESTART Systemd
+#=================================================
+ynh_script_progression --message="Restarting $app ..."
+
+ynh_systemd_action --service_name=$app --action=restart
+
+#=================================================
+# END OF SCRIPT
+#=================================================
+
+ynh_script_progression --message="Execution completed" --last
diff --git a/scripts/actions/remove_extensions b/scripts/actions/remove_extensions
new file mode 100644
index 0000000..afd7833
--- /dev/null
+++ b/scripts/actions/remove_extensions
@@ -0,0 +1,90 @@
+#!/bin/bash
+
+#=================================================
+# GENERIC STARTING
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source /usr/share/yunohost/helpers
+
+#=================================================
+# MANAGE SCRIPT FAILURE
+#=================================================
+
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
+#=================================================
+# RETRIEVE ARGUMENTS
+#=================================================
+
+app=$YNH_APP_INSTANCE_NAME
+path_url=$(ynh_app_setting_get --app=$app --key=path)
+domain=$(ynh_app_setting_get --app=$app --key=domain)
+
+#=================================================
+# CHECK IF ARGUMENTS ARE CORRECT
+#=================================================
+
+final_path=/opt/yunohost/$app
+config_file="$final_path/live/.env"
+
+if [ ! -f $config_file ]
+then
+    ynh_die --message="Standard Notes - Extensions can not be removed." --ret_code=1
+fi
+
+#=================================================
+# CHECK IF AN ACTION HAS TO BE DONE
+#=================================================
+
+install_extensions_old=$(ynh_app_setting_get --app=$app --key=install_extensions)
+
+if [ $install_extensions_old -eq 0 ]
+then
+    ynh_die --message="Standard Notes - Extensions should not be installed." --ret_code=0
+fi
+
+#=================================================
+# SPECIFIC ACTION
+#=================================================
+# MOVE TO PUBLIC OR PRIVATE
+#=================================================
+
+ynh_script_progression --message="Remove Standard Notes - Extensions ..." --weight=5
+
+ynh_replace_string --match_string="^RAILS_SERVE_STATIC_FILES=.*$" --replace_string="RAILS_SERVE_STATIC_FILES=" --target_file="$config_file"
+
+if [ "$path_url" = "/" ]
+then
+    path=""
+else
+    path=$path_url
+fi
+
+find "$final_path/live/public/extensions/src/" -name "*.json" -print0 | while read -d $'\0' file
+do
+    ynh_replace_string --match_string="$domain$path" --replace_string="__DOMAIN__PATH__" --target_file="$file"
+done
+
+find "$final_path/live/public/extensions/src/" -mindepth 1 -maxdepth 1 -type d -print0 | while read -d $'\0' dir
+do
+    ynh_secure_remove --file="$dir"
+done
+
+# Update the config of the app
+ynh_app_setting_set --app=$app --key=install_extensions --value="0"
+
+#=================================================
+# RESTART Systemd
+#=================================================
+ynh_script_progression --message="Restarting $app ..."
+
+ynh_systemd_action --service_name=$app --action=restart
+
+#=================================================
+# END OF SCRIPT
+#=================================================
+
+ynh_script_progression --message="Execution completed" --last
diff --git a/scripts/change_url b/scripts/change_url
index 8aefeb4..1a6097f 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -119,7 +119,7 @@ ynh_replace_string --match_string="RAILS_RELATIVE_URL_ROOT=$old_path" --replace_
 #=================================================
 # Modify Standard Notes - Extensions
 #=================================================
-if [ $install_extensions ]
+if [ $install_extensions -eq 1 ]
 then
     ynh_script_progression --message="Modify Standard Notes - Extensions..."  --weight=1
 
@@ -146,9 +146,9 @@ path_url=$new_path
 # Create a dedicated fail2ban config
 touch "/var/log/$app/$app.log"
 ynh_add_fail2ban_config --use_template --others_var="\
-	domain \
-	path_url \
-	"
+    domain \
+    path_url \
+    "
 
 #=================================================
 # GENERIC FINALISATION
@@ -174,21 +174,21 @@ ynh_script_progression --message="Sending a readme for the admin..."
 
 admin_panel="https://$(grep portal_domain /etc/ssowat/conf.json | cut -d'"' -f4)/yunohost/admin/#/apps/$app"
 
-message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\
+message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\n\
 You changed the url of the syncing server. All extensions installed from here must be reinstalled by the users."
-config_panel="You can configure this app by using the experimental __URL_TAG1__config-panel feature__URL_TAG2__$admin_panel/config-panel__URL_TAG3__"
+action="You can find some specific actions for this app by using the experimental __URL_TAG1__action feature__URL_TAG2__$admin_panel/actions__URL_TAG3__"
 
 ynh_replace_string --match_string="__TYPE__" --replace_string="changed the url" --target_file="../conf/message"
 ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="../conf/message"
 ynh_replace_string --match_string="__PATH_URL__" --replace_string="$path_url" --target_file="../conf/message"
 
-if [ $install_extensions ]
+if [ $install_extensions -eq 1 ]
 then
     ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_extensions" --target_file="../conf/message"
 else
     ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="" --target_file="../conf/message"
 fi
-ynh_replace_string --match_string="__CONFIG_PANEL__" --replace_string="$config_panel" --target_file="../conf/message"
+ynh_replace_string --match_string="__ACTION__" --replace_string="$action" --target_file="../conf/message"
 
 ynh_send_readme_to_admin --app_message="../conf/message" --type='upgrade'
 
diff --git a/scripts/install b/scripts/install
index 1060cb2..84e7f66 100755
--- a/scripts/install
+++ b/scripts/install
@@ -160,7 +160,7 @@ popd
 #=================================================
 # INSTALLING Standard Notes - Extensions
 #=================================================
-if [ $install_extensions ]
+if [ $install_extensions -eq 1 ]
 then
     ynh_script_progression --message="Installing Standard Notes - Extensions..."  --weight=1
 
@@ -284,29 +284,28 @@ ynh_systemd_action --service_name=nginx --action=reload
 #=================================================
 ynh_script_progression --message="Sending a readme for the admin..."
 
-message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\
+message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\n\
 If you want to change the url of the syncing server all extensions from here have to be reinstalled be the users."
-message_no_extensions="You have no extensions installed.\
+message_no_extensions="You have no extensions installed.\n\
 You can configure this app by using the config-panel"
 
 admin_panel="https://$(grep portal_domain /etc/ssowat/conf.json | cut -d'"' -f4)/yunohost/admin/#/apps/$app"
-config_panel="You can configure this app by using the experimental __URL_TAG1__config-panel feature__URL_TAG2__$admin_panel/config-panel__URL_TAG3__"
+action="You can find some specific actions for this app by using the experimental __URL_TAG1__action feature__URL_TAG2__$admin_panel/actions__URL_TAG3__"
 
 ynh_replace_string --match_string="__TYPE__" --replace_string="installed" --target_file="../conf/message"
 ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="../conf/message"
 ynh_replace_string --match_string="__PATH_URL__" --replace_string="$path_url" --target_file="../conf/message"
 
-if [ $install_extensions ]
+if [ $install_extensions -eq 1 ]
 then
     ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_extensions" --target_file="../conf/message"
 else
     ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_no_extensions" --target_file="../conf/message"
 fi
-ynh_replace_string --match_string="__CONFIG_PANEL__" --replace_string="$config_panel" --target_file="../conf/message"
+ynh_replace_string --match_string="__ACTION__" --replace_string="$action" --target_file="../conf/message"
 
 ynh_send_readme_to_admin --app_message="../conf/message" --type='install'
 
-echo ../conf/message
 #=================================================
 # END OF SCRIPT
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 1ba1cf7..a224e23 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -188,7 +188,7 @@ fi
 #=================================================
 # INSTALLING Standard Notes - Extensions
 #=================================================
-if [ $install_extensions ]
+if [ $install_extensions -eq 1 ]
 then
     ynh_script_progression --message="Reinstalling Standard Notes - Extensions..."  --weight=1
 
@@ -273,9 +273,9 @@ ynh_script_progression --message="Reconfiguring fail2ban..." --weight=1
 # Create a dedicated fail2ban config
 touch "/var/log/$app/$app.log"
 ynh_add_fail2ban_config --use_template --others_var="\
-	domain \
-	path_url \
-	"
+    domain \
+    path_url \
+    "
 
 #=================================================
 # SETUP SSOWAT
@@ -311,25 +311,25 @@ ynh_systemd_action --service_name=nginx --action=reload
 #=================================================
 ynh_script_progression --message="Sending a readme for the admin..."
 
-message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\
+message_extensions="To install extensions open this page: https://$domain$path_url/extensions/\n\
 If you want to change the url of the syncing server all extensions from here have to be reinstalled be the users."
-message_no_extensions="You have no extensions installed.\
+message_no_extensions="You have no extensions installed.\n\
 You can configure this app by using the config-panel"
 
 admin_panel="https://$(grep portal_domain /etc/ssowat/conf.json | cut -d'"' -f4)/yunohost/admin/#/apps/$app"
-config_panel="You can configure this app by using the experimental __URL_TAG1__config-panel feature__URL_TAG2__$admin_panel/config-panel__URL_TAG3__"
+action="You can find some specific actions for this app by using the experimental __URL_TAG1__action feature__URL_TAG2__$admin_panel/actions__URL_TAG3__"
 
 ynh_replace_string --match_string="__TYPE__" --replace_string="installed" --target_file="../conf/message"
 ynh_replace_string --match_string="__DOMAIN__" --replace_string="$domain" --target_file="../conf/message"
 ynh_replace_string --match_string="__PATH_URL__" --replace_string="$path_url" --target_file="../conf/message"
 
-if [ $install_extensions ]
+if [ $install_extensions -eq 1 ]
 then
     ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_extensions" --target_file="../conf/message"
 else
     ynh_replace_string --match_string="__EXTENSIONS__" --replace_string="$message_no_extensions" --target_file="../conf/message"
 fi
-ynh_replace_string --match_string="__CONFIG_PANEL__" --replace_string="$config_panel" --target_file="../conf/message"
+ynh_replace_string --match_string="__ACTION__" --replace_string="$action" --target_file="../conf/message"
 
 ynh_send_readme_to_admin --app_message="../conf/message" --type='upgrade'