diff --git a/FirefoxAutoPlaceWindows b/FirefoxAutoPlaceWindows
index 19d2eb6..cf69a27 100644
--- a/FirefoxAutoPlaceWindows
+++ b/FirefoxAutoPlaceWindows
@@ -39,7 +39,7 @@ function placeWindowOnDesktop(){
 		window=( $window )
 		echo -e "Place window ⟪\E[010;92m${window[@]:1}(id=${window[0]})\E[0m⟫ to desktop ⟪\E[010;93m${_desk[@]:1}(id=${_desk[0]})\E[0m⟫"
 		wmctrl -i -r ${window[0]} -t ${_desk[0]}
-	done < <( wmctrl -l | fgrep "${1}" | awk '{$2=""; $3=""}1' )
+	done < <( wmctrl -l | grep -F "${1}" | awk '{$2=""; $3=""}1' )
 }
 
 # $1 - desktop sub-sting name
@@ -60,20 +60,20 @@ function deskName(){
 # Magic function to distribute all Firefox windows by its desktops automatically!
 # This is consider only Firefox windows, and get desktop tag-name from [] square brackets.
 # F.e. for windows:
-# $ wmctrl -lx | fgrep 'Navigator.Firefox'
+# $ wmctrl -lx | grep -F 'Navigator.Firefox'
 # 0x03a000c5  3 Navigator.Firefox     2.hubbitus.taskdata [Home] bash - Extract string from brackets - Stack Overflow - Mozilla Firefox
 # 0x03a000ad  5 Navigator.Firefox     2.hubbitus.taskdata [RDC] rdc-iac-ansible/cleaning-snapshots.sh at ebf2122335387a66cb043f0480d8f38e6a087d39 · RegDC/rdc-iac-ansible - Mozilla Firefox
 # 0x03a00089  5 Navigator.Firefox     2.hubbitus.taskdata [RDC] How to slice an array in Bash - Stack Overflow - Mozilla Firefox
 # 0x03a000b9  0 Navigator.Firefox     2.hubbitus.taskdata [Egais] Firefox desktop placement issue - Mozilla Firefox
 # Home, RDC and Egais will be searched in desktop names for place windows on it accordingly!
 function matchAllFirefoxWindowsByDesktops(){
-	for word in $( wmctrl -lx | fgrep 'Navigator.firefox' | awk -F"[][]" '{print $2}' | sort -u ); do
+	for word in $( wmctrl -lx | grep -F 'Navigator.firefox' | awk -F"[][]" '{print $2}' | sort -u ); do
 		placeWindowOnDesktop "[$word]" "$word"
 	done
 }
 
 function matchAllNightlyWindowsByDesktops(){
-	for word in $( wmctrl -lx | fgrep 'Navigator.Nightly' | awk -F"[][]" '{print $2}' | sort -u ); do
+	for word in $( wmctrl -lx | grep -F 'Navigator.Nightly' | awk -F"[][]" '{print $2}' | sort -u ); do
 		placeWindowOnDesktop "[$word]" "$word"
 	done
 }