Fix some random tests

Closes #3403162

.gitlab-ci/pipeline-test-only.yml

@@ -4,7 +4,6 @@ stages:
   - 🗜️ Test
 
 variables:
-  FF_NETWORK_PER_BUILD: 1
   SIMPLETEST_BASE_URL: http://localhost/subdirectory
   DB_DRIVER: mysql
   MYSQL_ROOT_PASSWORD: root