diff --git a/rootfs/etc/cont-init.d/55-firefox.sh b/rootfs/etc/cont-init.d/55-firefox.sh
index 1f89ef1..1fe8c77 100755
--- a/rootfs/etc/cont-init.d/55-firefox.sh
+++ b/rootfs/etc/cont-init.d/55-firefox.sh
@@ -62,10 +62,15 @@ if [ -n "$(ls /config/profile/sessionstore-backups/*.jsonlz4 2>/dev/null)" ]; th
     done
 fi
 
-# Make sure monitored log files exist.
-for LOG_FILE in /config/log/firefox/error.log
+# Initialize log files.
+for LOG_FILE in /config/log/firefox/output.log /config/log/firefox/error.log
 do
     touch "$LOG_FILE"
+
+    # Make sure the file doesn't grow indefinitely.
+    if [ "$(stat -c %s "$LOG_FILE")" -gt 1048576 ]; then
+       echo > "$LOG_FILE"
+    fi
 done
 
 # vim: set ft=sh :