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examples/firefox-esr

This directory contains a simple example of a Cypress E2E test with one test spec cypress/e2e/spec.cy.js running using the Mozilla Firefox browser from the ESR (Extended Support Release) channel.

Choosing a Firefox update channel explains the Firefox "Extended Support Release (ESR)".

Non-Docker demonstration

Install Firefox ESR on your host system.

Use regular Cypress CLI commands to run Cypress with Firefox (ESR):

cd examples/firefox-esr
npm ci
npx cypress run --browser firefox
npx cypress open --e2e --browser firefox

Docker

In the Docker examples below, the Firefox ESR browser is installed from Debian distribution sources. See the firefox-esr package (bookworm (stable) section) covering amd64 arm64 armhf i386 mips64el ppc64el s390x processor architectures.

Docker interactive

In this example we first run the unchanged image cypress/base as a container:

cd examples/firefox-esr  # Use a pre-configured simple Cypress E2E project
npm ci                # Install Cypress
docker run -it --rm -v .:/e2e -w /e2e cypress/base  # Run image as container

At the bash prompt :/e2e#, we can then enter the following commands:

apt-get update                     # Update package index
apt-get install firefox-esr -y     # Install Firefox ESR
unset CI                           # Allows to see installation progress
npx cypress install                # Install Cypress binary into running Docker container
npx cypress run --browser firefox  # Run Cypress test
exit

Docker build and run

In this example we use a customized Dockerfile which bases a new image on cypress/base, copies the complete Cypress project into the image, including installed dependencies, then installs Firefox ESR and the Cypress binary into the image.

The file is examples/firefox-esr/Dockerfile and it has the following contents:

FROM cypress/base
COPY . /opt/app
WORKDIR /opt/app
RUN apt-get update                 # Update package index
RUN apt-get install firefox-esr -y # Install Firefox ESR
RUN npx cypress install            # Install Cypress binary

We build the new image, run the container from the image and execute the Cypress command npx cypress run --browser firefox to run the test using Firefox ESR:

cd examples/firefox-esr             # Use a pre-configured simple Cypress E2E project
npm ci                              # Install all dependencies
docker build . -t test-firefox-esr  # Build a new image
docker run -it --rm --entrypoint bash test-firefox-esr -c "npx cypress run --browser firefox" # Run Cypress test using Firefox ESR