diff --git a/xdg-sanity b/xdg-sanity
index 7db0629..9a00659 100755
--- a/xdg-sanity
+++ b/xdg-sanity
@@ -20,6 +20,19 @@ set -e
 
 argv0="$0"
 
+get_urls() {
+  i="0"
+  until ! tomcat replace.urls["$i"] "$file" >/dev/null 2>&1
+  do
+    URLS="$(printf "%s\n%s" \
+      "$URLS" \
+      "$(tomcat replace.urls["$i"] "$file")"
+    )"
+
+    i="$(printf "%s+1\n" "$i" | bc)"
+  done
+}
+
 # check if usage is valid
 if test -z "$1"; then
   printf "Usage: %s [resource...]\n" "$argv0" 1>&2
@@ -28,8 +41,7 @@ fi
 
 for dep in \
   curl \
-  handlr \
-  tomcat
+  handlr
 do
   if ! command -v "$dep" >/dev/null 2>&1; then
     printf "%s: Missing dependency: %s(1)\n" "$argv0" "$dep" 1>&2
@@ -46,9 +58,8 @@ fi
 while test -n "$1"; do
   URL="$1"
 
-  # use curl(1) to write out the request header's content_type,
-  # strip everything after the first semicolon,
-  # chop off any weird whitespace remnants
+  # use curl(1) to write out the request header's content_type, strip everything
+  # after the first semicolon, chop off any weird whitespace remnants
   MIME="$(curl -Ls -o /dev/null -w '%{content_type}' "$1" | sed 's/\;.*//' \
     | xargs echo)"
 
@@ -56,39 +67,40 @@ while test -n "$1"; do
   MATCH="$(printf "%s\n" "$URL" | sed -ne 's/^h.\+\/\///p' \
     | sed -e 's/\/.*\+//g')"
   
-  # run through MIME extensions
-  for file in \
-    "$XDG_DATA_HOME"/xdg-sanity/*-mime.toml \
-    /usr/share/xdg-sanity/*-mime.toml \
-    /usr/local/share/xdg-sanity/*-mime.toml
-  do
-    if test -e "$file"; then
-      i=$(tomcat replace.urls "$file" | sed 's/	/\n/g' | wc -l)
-      while ! [ "$i" = 0 ]; do
-        if [ "$MATCH" = "$(tomcat replace.urls["$i"] "$file")" ]; then
-          MIME="$(tomcat with.mime "$file")"
-        fi
-        i="$(printf "%s-1\n" "$i" | bc)"
-      done
-    fi
-  done
+  # only check for extensions if tomcat(1) is installed
+  if command -v tomcat >/dev/null 2>&1; then
+    # run through MIME extensions
+    for file in \
+      "$XDG_DATA_HOME"/xdg-sanity/*-mime.toml \
+      /usr/share/xdg-sanity/*-mime.toml \
+      /usr/local/share/xdg-sanity/*-mime.toml
+    do
+      if test -e "$file"; then
+        get_urls
+        for url in $URLS; do
+          if [ "$MATCH" = "$url" ]; then
+            MIME="$(tomcat with.mime "$file")"
+          fi
+        done
+      fi
+    done
 
-  # and the replace extensions
-  for file in \
-    "$XDG_DATA_HOME"/xdg-sanity/*-replace.toml \
-    /usr/share/xdg-sanity/*-replace.toml \
-    /usr/local/share/xdg-sanity/*-replace.toml
-  do
-    if test -e "$file"; then
-      i="$(tomcat replace.urls "$file" | sed 's/	/\n/g' | wc -l)"
-      while ! [ "$i" = 0 ]; do
-        if [ "$MATCH" = "$(tomcat replace.urls["$i"] "$file")" ]; then
-          URL="$(tomcat with.url "$file")"
-        fi
-        i="$(printf "%s-1\n" "$i" | bc)"
-      done
-    fi
-  done
+    # and the replace extensions
+    for file in \
+      "$XDG_DATA_HOME"/xdg-sanity/*-replace.toml \
+      /usr/share/xdg-sanity/*-replace.toml \
+      /usr/local/share/xdg-sanity/*-replace.toml
+    do
+      if test -e "$file"; then
+        get_urls
+        for url in $URLS; do
+          if [ "$MATCH" = "$url" ]; then
+            URL="$(tomcat with.url "$file")"
+          fi
+        done
+      fi
+    done
+  fi
 
   # these commands may fail; this is intentional
   if [ "$MIME" = "text/html" ]; then