diff --git a/README.md b/README.md
index db1b1f1..9a700e9 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,11 @@ cd check_selenium_docker/dockerimage/
 docker build . --tag opsdis/selenium-chrome-node-with-side-runner
 ```
 
+Image for an alternative supported browser:
+
+```
+sed 's/chrome/firefox/' Dockerfile | docker build --tag opsdis/selenium-firefox-node-with-side-runner -
+```
 
 # Plugin #
 
@@ -124,6 +129,23 @@ chmod 777 /opt/plugins/custom/selenium/opsdis.com/out/
 chmod 755 /opt/plugins/custom/selenium/opsdis.com/sides/opsdis.com.side
 ```
 
+Optionally add a runner local configuration file or additional command-line
+arguments to pass, for example:
+
+```
+cat <<EOT > /opt/plugins/custom/selenium/opsdis.com/sides/.options
+--filter MyTestSuite
+EOT
+
+cat <<EOT > /opt/plugins/custom/selenium/opsdis.com/sides/.side.yml
+capabilities:
+  acceptInsecureCerts: true
+EOT
+```
+
+See [Command-line Runner / Run-time configuration](https://www.selenium.dev/selenium-ide/docs/en/introduction/command-line-runner#run-time-configuration).
+
+
 The directory structure should look like this:
 
 ```
@@ -131,6 +153,8 @@ The directory structure should look like this:
 │   ├── out
 │   └── sides
 │       └── opsdis.com.side
+│       └── .side.yml
+│       └── .options
 ```
 
 # Execute the plugin #
diff --git a/dockerimage/Dockerfile b/dockerimage/Dockerfile
index 321366f..ce851bf 100644
--- a/dockerimage/Dockerfile
+++ b/dockerimage/Dockerfile
@@ -5,9 +5,9 @@ LABEL maintainer="Opsdis Consulting AB <info@opsdis.com>"
 # selenium container leaves us as user 'seluser', but we need to install more stuff
 USER root
 
-# Install nodejs 10 which includes npm
+# Install nodejs LTS which includes npm
 RUN apt-get -qqy update \
-  && curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash - \
+  && curl -sL https://deb.nodesource.com/setup_lts.x | sudo -E bash - \
   && apt-get -qqy --no-install-recommends install \
     nodejs \
   && rm -rf /var/lib/apt/lists/* /var/cache/apt/*
@@ -21,6 +21,11 @@ RUN mkdir /selenium-side-runner && chown -R seluser /selenium-side-runner
 WORKDIR /selenium-side-runner
 
 # Five seconds after starting container (as deamon) selenium-side-runner will run every /sides/*.side file
-RUN sed -i '/^\/usr\/bin\/supervisord.*/a sleep 5 && selenium-side-runner --server http://localhost:4444/wd/hub --output-directory /selenium-side-runner/out /sides/*.side' /opt/bin/entry_point.sh
+RUN sed -i "/^\/usr\/bin\/supervisord.*/a \
+OPTS=('-c browserName=chrome --server http://localhost:4444/wd/hub' '--output-directory /selenium-side-runner/out')\n\
+[[ -s /sides/.options ]] && readarray -t -O 2 OPTS < /sides/.options\n\
+[[ -s /sides/.side.yml ]] && OPTS+=('--config /sides/.side.yml')\n\
+sleep 5 && selenium-side-runner \${OPTS[@]} /sides/*.side &> /selenium-side-runner/out/output.log" \
+/opt/bin/entry_point.sh
 
 USER seluser