diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6a6786f..7c661dc 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -18,6 +18,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
+      - uses: browser-actions/setup-firefox@latest
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node }}
diff --git a/karma.conf.js b/karma.conf.js
index e0e473a..1ac0776 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -8,7 +8,7 @@ module.exports = function (config) {
       'test/*.js'
     ],
 
-    browsers: ['Firefox'],
+    browsers: ['FirefoxHeadless'],
 
     autoWatch: true,