--- a/taskcluster/taskgraph/transforms/tests.py
+++ b/taskcluster/taskgraph/transforms/tests.py
@@ -508,17 +508,16 @@ def handle_keyed_by(config, tests):
 
 @transforms.add
 def enable_code_coverage(config, tests):
     """Enable code coverage for the linux64-ccov/opt & linux64-jsdcov/opt build-platforms"""
     for test in tests:
         if test['build-platform'] == 'linux64-ccov/opt':
             test['mozharness'].setdefault('extra-options', []).append('--code-coverage')
             test['instance-size'] = 'xlarge'
-            test['e10s'] = False
             test['run-on-projects'] = []
         elif test['build-platform'] == 'linux64-jsdcov/opt':
             test['run-on-projects'] = []
         yield test
 
 
 @transforms.add
 def handle_run_on_projects(config, tests):