diff --git a/.github/workflows/ci-java.yml b/.github/workflows/ci-java.yml
index 8fe8697f24573..7bc1e2e197f4f 100644
--- a/.github/workflows/ci-java.yml
+++ b/.github/workflows/ci-java.yml
@@ -189,6 +189,8 @@ jobs:
           matrix.browser == 'chrome'
       - name: Start XVFB
         run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - name: Run browser tests in ${{ matrix.browser }}
         uses: ./.github/actions/bazel-test
         with:
@@ -243,6 +245,8 @@ jobs:
           matrix.browser == 'chrome'
       - name: Start XVFB
         run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - name: Run server tests
         uses: ./.github/actions/bazel-test
         with:
@@ -280,6 +284,8 @@ jobs:
           version: latest
       - name: Start XVFB
         run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - name: Run browser tests in Firefox
         uses: ./.github/actions/bazel-test
         with:
diff --git a/.github/workflows/ci-javascript.yml b/.github/workflows/ci-javascript.yml
index 70991e0e3a754..7ba4007c07fe5 100644
--- a/.github/workflows/ci-javascript.yml
+++ b/.github/workflows/ci-javascript.yml
@@ -67,6 +67,8 @@ jobs:
           matrix.browser == 'chrome'
       - name: Start XVFB
         run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - name: Run JavaScript tests
         uses: ./.github/actions/bazel-test
         with:
@@ -104,6 +106,8 @@ jobs:
           version: ${{ matrix.version }}
       - name: Start XVFB
         run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - name: Run atom tests on Firefox
         uses: ./.github/actions/bazel
         with:
diff --git a/.github/workflows/ci-python.yml b/.github/workflows/ci-python.yml
index a7f504b1b5941..bd70ca366dee6 100644
--- a/.github/workflows/ci-python.yml
+++ b/.github/workflows/ci-python.yml
@@ -144,6 +144,8 @@ jobs:
         uses: ./.github/actions/setup-chrome
       - name: Start XVFB
         run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - name: Run browser tests in Chrome
         uses: ./.github/actions/bazel-test
         with:
@@ -183,6 +185,8 @@ jobs:
         uses: ./.github/actions/setup-firefox
       - name: Start XVFB
         run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - name: Run browser tests in Firefox (Remote)
         uses: ./.github/actions/bazel
         with:
@@ -221,6 +225,8 @@ jobs:
         uses: ./.github/actions/setup-firefox
       - name: Start XVFB
         run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - name: Run browser tests in Firefox
         uses: ./.github/actions/bazel-test
         with:
diff --git a/.github/workflows/ci-ruby.yml b/.github/workflows/ci-ruby.yml
index 4e0e6b35cd0a7..ab4780fe838ea 100644
--- a/.github/workflows/ci-ruby.yml
+++ b/.github/workflows/ci-ruby.yml
@@ -75,7 +75,10 @@ jobs:
             ${{ runner.os }}-bazel-ruby-${{ matrix.target }}-
       - uses: ./.github/actions/setup-bazelisk
       - uses: ./.github/actions/setup-chrome
-      - run: Xvfb :99 &
+      - name: Start XVFB
+        run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - uses: ./.github/actions/bazel
         with:
           command: test --test_output=all //rb:${{ matrix.target }}
@@ -109,7 +112,10 @@ jobs:
       - uses: ./.github/actions/setup-bazelisk
       - name: Setup Firefox and GeckoDriver
         uses: ./.github/actions/setup-firefox
-      - run: Xvfb :99 &
+      - name: Start XVFB
+        run: Xvfb :99 &
+      - name: Start Fluxbox
+        run: sudo apt-get -y install fluxbox && fluxbox &
       - uses: ./.github/actions/bazel
         with:
           command: test --test_output=all //rb:${{ matrix.target }}