diff --git a/menus_functions_ub1804.sh b/menus_functions_ub1804.sh
index 0666a7b..f7c9de9 100644
--- a/menus_functions_ub1804.sh
+++ b/menus_functions_ub1804.sh
@@ -122,9 +122,7 @@ function showSysToolsMenu () {
     "inxi" "System informations" \
     "speedtest-cli" "Bandwidth test" \
     "packetloss" "Packetloss test (ping)" \
-    "OptimizeFirefox" "Firefox SQLite databases optimization" \
     "Autoremove" "Remove useless Deb packages" \
-    "CleanOldKernels" "Removing old kernels (keep 2 last kernels)" \
     "SoundCardsDetection" "Sound Cards Detection" \
     "Back" "Back"  3>&1 1>&2 2>&3)
 
@@ -138,15 +136,9 @@ function showSysToolsMenu () {
       "packetloss")
         clear; toolPacketLoss; pressKey
         ;;
-      "OptimizeFirefox")
-        clear; toolOptimizeFirefox; pressKey
-        ;;
       "Autoremove")
         clear; toolAutoremove; pressKey
         ;;
-      "CleanOldKernels")
-        clear; toolClearOldKernels; pressKey
-        ;;
       "SoundCardsDetection")
         clear; toolSoundCardsDetection; pressKey
         ;;
diff --git a/menus_functions_ub2004.sh b/menus_functions_ub2004.sh
index de3ade1..62dbc2e 100644
--- a/menus_functions_ub2004.sh
+++ b/menus_functions_ub2004.sh
@@ -122,9 +122,7 @@ function showSysToolsMenu () {
     "inxi" "System informations" \
     "speedtest-cli" "Bandwidth test" \
     "packetloss" "Packetloss test (ping)" \
-    "OptimizeFirefox" "Firefox SQLite databases optimization" \
     "Autoremove" "Remove useless Deb packages" \
-    "CleanOldKernels" "Removing old kernels (keep 2 last kernels)" \
     "SoundCardsDetection" "Sound Cards Detection" \
     "Back" "Back"  3>&1 1>&2 2>&3)
 
@@ -138,15 +136,9 @@ function showSysToolsMenu () {
       "packetloss")
         clear; toolPacketLoss; pressKey
         ;;
-      "OptimizeFirefox")
-        clear; toolOptimizeFirefox; pressKey
-        ;;
       "Autoremove")
         clear; toolAutoremove; pressKey
         ;;
-      "CleanOldKernels")
-        clear; toolClearOldKernels; pressKey
-        ;;
       "SoundCardsDetection")
         clear; toolSoundCardsDetection; pressKey
         ;;
diff --git a/tools_functions.sh b/tools_functions.sh
index 1956bb5..20a46e6 100644
--- a/tools_functions.sh
+++ b/tools_functions.sh
@@ -101,26 +101,6 @@ function toolPacketLoss () {
   ping -q -c 10 google.com
 }
 
-#
-# Optimization of SQLite databases of Firefox and Firefox Nightly
-#
-function toolOptimizeFirefox () {
-  if (whiptail --title "Firefox SQLite DB Optimization" --yesno "Terminate Firefox and proceed ?" 10 60) then
-    if which firefox >/dev/null; then
-      printf "Optimizing Firefox"
-      pkill -9 firefox
-      for f in ~/.mozilla/firefox/*/*.sqlite; do sqlite3 $f 'VACUUM; REINDEX;'; done
-      printf "\n"
-    fi
-    if which firefox-trunk >/dev/null; then
-      printf "Optimizing Firefox Nightly"
-      pkill -9 firefox-trunk
-      for f in ~/.mozilla/firefox-trunk/*/*.sqlite; do sqlite3 $f 'VACUUM; REINDEX;'; done
-      printf "\n"
-    fi
-  fi
-}
-
 #
 # remove useless packages (depedencies)
 #
@@ -129,15 +109,6 @@ function toolAutoremove () {
          "removing not necessary dependencies"
 }
 
-#
-# remove old versions of installed kernels
-#
-function toolClearOldKernels () {
-  checkAndInstallDep apt ukuu ukuu \
-  && runCmd "sudo ukuu --purge-old-kernels --yes" \
-            "removing old kernels"
-}
-
 #
 # force soundcards detection
 #