diff --git a/packages/common/.gitlab-ci.yml b/packages/common/.gitlab-ci.yml
index 79aa682a96015c4144d6bd0e36604d1e516b92d9..7dcb7aa6beeb702bba6957d35b42ba7a6ef8a4db 100644
--- a/packages/common/.gitlab-ci.yml
+++ b/packages/common/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: registry.gitlab.tugraz.at/vpu/webcomponents/common/main:v4
+image: registry.gitlab.tugraz.at/vpu/webcomponents/common/main:v5
 
 before_script:
   - "sed -i 's|git@gitlab.tugraz.at:VPU|../..|g' .gitmodules"
diff --git a/packages/common/.gitlab-ci/Dockerfile b/packages/common/.gitlab-ci/Dockerfile
index ccdb25d64baed375a291ca563c4c23cb070e4fa3..74e3b53f10ad77844396968b47b4a1636ca982a3 100644
--- a/packages/common/.gitlab-ci/Dockerfile
+++ b/packages/common/.gitlab-ci/Dockerfile
@@ -3,6 +3,9 @@ FROM debian:buster
 ENV LANG C.UTF-8
 ENV DEBIAN_FRONTEND noninteractive
 
+# https://github.com/karma-runner/karma-firefox-launcher/issues/104
+ENV MOZ_FORCE_DISABLE_E10S true
+
 RUN apt-get update && apt-get install -y \
     git \
     curl \
diff --git a/packages/common/.gitlab-ci/build.sh b/packages/common/.gitlab-ci/build.sh
index 01ca8e85611e72195c9f9ec814c2e4d0768f7f15..e204355e78d376efe2e9b628f1bab65ed65e02f3 100755
--- a/packages/common/.gitlab-ci/build.sh
+++ b/packages/common/.gitlab-ci/build.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
 set -e
-TAG="registry.gitlab.tugraz.at/vpu/webcomponents/common/main:v4"
+TAG="registry.gitlab.tugraz.at/vpu/webcomponents/common/main:v5"
 sudo docker build --tag "${TAG}" --file "Dockerfile" .
 echo "Now run: sudo docker push '$TAG'"