diff --git a/README.md b/README.md
index 399d9ce..f96f609 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,12 @@ A sane default firefox profile
 ```bash
 NAME=$RANDOM
 git clone https://austenwares.com/gogs/stonewareslord/firefox-link ~"/Library/Application Support/Firefox/Profiles/$NAME"
-printf "\n[Profile$((1+$(cat ~"/Library/Application Support/Firefox/profiles.ini" | ag '\[Profile\d+\]' | tail -n1 | sed -e 's/\[Profile//' -e 's/\]//')))]\nName=firefox-link\nIsRelative=1\nPath=Profiles/$NAME">>~"/Library/Application Support/Firefox/profiles.ini"
+egrep -q '\[Profile\d+\]' ~"/Library/Application Support/Firefox/profiles.ini" 
+if (( $? == 0 )); then
+  printf "\n[Profile$(expr 1 + $(cat ~"/Library/Application Support/Firefox/profiles.ini" | egrep '\[Profile\d+\]' | tail -n1 | sed -e 's/\[Profile//' -e 's/\]//'))]\nName=firefox-link\nIsRelative=1\nPath=Profiles/$NAME">>~"/Library/Application Support/Firefox/profiles.ini"
+else
+  mkdir -p ~"/Library/Application Support/Firefox/"
+  printf "\n[Profile0]\nName=firefox-link\nIsRelative=1\nPath=Profiles/$NAME">>~"/Library/Application Support/Firefox/profiles.ini"
+fi
 '/Applications/Firefox.app/Contents/MacOS/firefox' -p
 ```