diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index a918fd4b7..47142f1b1 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -23,7 +23,7 @@ jobs:
     - name: Run test on default container for Edge 
       run: docker run --rm sitespeedio/sitespeed.io https://www.sitespeed.io -n 1 -b edge
     - name: Run test on slim container  
-      run: docker run --rm sitespeedio/sitespeed.io:slim https://www.sitespeed.io -n 1
+      run: docker run --rm sitespeedio/sitespeed.io:slim https://www.sitespeed.io -n 1 --browsertime.firefox.preference "devtools.netmonitor.persistlog:true"
     - name: Test WebPageReplay with Chrome  
       run: docker run --cap-add=NET_ADMIN --rm  -e REPLAY=true -e LATENCY=100 sitespeedio/sitespeed.io https://www.sitespeed.io -n 3 -b chrome 
     - name: Test WebPageReplay with Firefox