diff --git a/config.yaml b/config.yaml
index e382348..9ef3623 100644
--- a/config.yaml
+++ b/config.yaml
@@ -108,7 +108,7 @@ variables:
     - 'yarn.*'
 
 dynvariables:
-  mozilla_path: find ~/.mozilla/firefox -maxdepth 1 -name '*.default*' -and -not -name '*.bak' || true
+  mozilla_path: find ~/.mozilla/firefox -maxdepth 1 -name '*.default*' -and -not -name '*.bak' -and -not -name '*back*'|| true
   cura_version: cura --version 2>/dev/null | sed 's/.*\([0-9]\+\.[0-9]\+\)\.[0-9]\+/\1/'
   # Use a dynamic variable as a path and populate it with crontab
   # Hack to make compare work correctly