diff --git a/addons/api/testem.js b/addons/api/testem.js
index 854db8659..dfb911881 100644
--- a/addons/api/testem.js
+++ b/addons/api/testem.js
@@ -3,7 +3,7 @@
 module.exports = {
   test_page: 'tests/index.html?hidepassed',
   disable_watching: true,
-  launch_in_ci: ['Chrome', 'Firefox'],
+  launch_in_ci: ['Chrome'],
   launch_in_dev: ['Chrome', 'Firefox'],
   browser_start_timeout: 120,
   browser_args: {
diff --git a/addons/auth/testem.js b/addons/auth/testem.js
index 854db8659..dfb911881 100644
--- a/addons/auth/testem.js
+++ b/addons/auth/testem.js
@@ -3,7 +3,7 @@
 module.exports = {
   test_page: 'tests/index.html?hidepassed',
   disable_watching: true,
-  launch_in_ci: ['Chrome', 'Firefox'],
+  launch_in_ci: ['Chrome'],
   launch_in_dev: ['Chrome', 'Firefox'],
   browser_start_timeout: 120,
   browser_args: {
diff --git a/addons/rose/testem.js b/addons/rose/testem.js
index 854db8659..dfb911881 100644
--- a/addons/rose/testem.js
+++ b/addons/rose/testem.js
@@ -3,7 +3,7 @@
 module.exports = {
   test_page: 'tests/index.html?hidepassed',
   disable_watching: true,
-  launch_in_ci: ['Chrome', 'Firefox'],
+  launch_in_ci: ['Chrome'],
   launch_in_dev: ['Chrome', 'Firefox'],
   browser_start_timeout: 120,
   browser_args: {
diff --git a/ui/core/testem.js b/ui/core/testem.js
index be5731f94..7381bd84e 100644
--- a/ui/core/testem.js
+++ b/ui/core/testem.js
@@ -1,7 +1,7 @@
 module.exports = {
   test_page: 'tests/index.html?hidepassed',
   disable_watching: true,
-  launch_in_ci: ['Chrome', 'Firefox'],
+  launch_in_ci: ['Chrome'],
   launch_in_dev: ['Chrome', 'Firefox'],
   browser_start_timeout: 120,
   browser_args: {