diff --git a/uuids.sh b/uuids.sh
new file mode 100644
index 0000000..d016396
--- /dev/null
+++ b/uuids.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+
+## Mac
+## arg1 - required:
+##     add: add UUIDs found in internal_UUID.txt to corresponding .css files
+##     remove: add UUIDs found in internal_UUID.txt to corresponding .css files
+## arg2 - optional:
+##     nogen: don't generate internal_UUIDs.txt before adding/removing
+## designed for users using userContent_imports.css
+## entries in internal_UUIDs.txt should take on the following format:  webextension_id=internal_UUID
+## author: @overdodactyl
+## version: 1.0
+
+# Original: "scripts/internal_UUIDs.txt"
+UUID_FILE="internal_UUIDs.txt"
+
+method=$1
+uuid_finder=${2:-gen}
+
+# Determine whether UUIDs will be inserted or removed
+if [ $method = "add" ]; then
+  var1=0
+  var2=1
+  var3="inserted"
+elif [ $method = "remove" ]; then
+  var1=1
+  var2=0
+  var3="removed"
+else
+  echo "must pass argument add or remove"
+  exit 1
+fi
+
+currdir=$(pwd)
+sfp=$(readlink -f "${BASH_SOURCE[0]}" 2>/dev/null || greadlink -f "${BASH_SOURCE[0]}" 2>/dev/null)
+if [ -z "$sfp" ]; then sfp=${BASH_SOURCE[0]}; fi
+cd "$(dirname "${sfp}")" && cd ..
+
+if [ $uuid_finder != "nogen" ]; then
+  ## Generate internal_UUIDs.txt
+  touch "${UUID_FILE}"
+
+  ## Get installed extesnsions from prefs.js
+  line=$(sed -n -e 's/^user_pref("extensions.webextensions.uuids", "{\(.*\).*}");/\1/p' ./../prefs.js)
+
+  ## Clear internal_UUIDS.txt
+  > "${UUID_FILE}"
+
+  ## Write to internal_UUIDs
+  IFS=',' read -ra EXTS <<< "$line"
+  for i in "${EXTS[@]}"; do
+    id=$(echo $i | sed -n 's/.*"\(.*\)\\":.*/\1/p')
+    uuid=$(echo $i | sed -n 's/.*"\(.*\)\\".*/\1/p')
+    echo "$id=$uuid" >> "${UUID_FILE}"
+  done
+  echo "${UUID_FILE} was created"
+fi
+
+
+## Insert/remove any UUIDs defined in internal_UUIDs.txt into userContent.css
+while IFS='' read -r line || [[ -n "$line" ]]; do
+    IFS='=' read -r -a array <<< "$line"
+    webextension_name=${array[0]%_UUID}
+    for filename in css/userContent-files/webextension-tweaks/*.css; do
+      sed -i '' "s/${array[$var1]}/${array[$var2]}/" "${filename}"
+      ##echo ${filename}
+    done
+    sed -i '' "s/${array[$var1]}/${array[$var2]}/" "userContent.css"
+done < "scripts/internal_UUIDs.txt"
+echo "UUIDs were ${var3}"