diff --git a/taskcluster/ci/config.yml b/taskcluster/ci/config.yml
index f40fbad65995..863cf3a033c6 100644
--- a/taskcluster/ci/config.yml
+++ b/taskcluster/ci/config.yml
@@ -44,16 +44,12 @@ treeherder:
         'M-fis': 'Mochitests with fission enabled'
         'M-spi': 'Mochitests with socket process'
         'M-spi-1proc': 'Mochitests with socket process without e10s'
-        'M-sw': 'Mochitests with serviceworker redesign'
-        'M-sw-1proc': 'Mochitests with serviceworker redesign without e10s'
         'M-V-1proc': 'Mochitests on Valgrind without e10s'
         'MSI': 'Repack installers into MSIs'
         'MSIs': 'Signing of Repacked installers of MSIs'
         'R': 'Reftests'
         'R-1proc': 'Reftests without e10s'
         'R-fis': 'Reftests with fission enabled'
-        'R-sw': 'Reftests with serviceworker redesign'
-        'R-sw-1proc': 'Reftests with serviceworker redesign enabled without e10s'
         'Rap': 'Raptor performance tests on Firefox'
         'Rap-1proc': 'Raptor performance tests on Firefox without e10s'
         'Rap-fis': 'Raptor performance tests on Firefox with fission enabled'
@@ -85,13 +81,9 @@ treeherder:
         'W': 'Web platform tests'
         'W-1proc': 'Web platform tests without e10s'
         'W-fis': 'Web platform tests with fission enabled'
-        'W-sw': 'Web platform tests with serviceworker redesign'
-        'W-sw-1proc': 'Web platform tests with serviceworker redesign, without e10s'
         'X': 'Xpcshell tests'
         'X-1proc': 'Xpcshell tests, without e10s'
         'X-fis': 'Xpcshell tests with fission enabled'
-        'X-sw': 'Xpcshell tests with serviceworker redesign'
-        'X-sw-1proc': 'Xpcshell tests with serviceworker redesign, without e10s'
         'L10n': 'Localised Repacks'
         'L10n-Rpk': 'Localized Repackaged Repacks'
         'BM': 'Beetmover'
diff --git a/taskcluster/ci/test/mochitest.yml b/taskcluster/ci/test/mochitest.yml
index a9ee4f508dcb..39893ad2a62b 100644
--- a/taskcluster/ci/test/mochitest.yml
+++ b/taskcluster/ci/test/mochitest.yml
@@ -12,7 +12,7 @@ job-defaults:
             default: null
     variants:
         by-test-platform:
-            linux.*64/debug: ['fission', 'serviceworker']
+            linux.*64/debug: ['fission']
             default: ['fission']
     run-on-projects:
         by-test-platform:
@@ -268,7 +268,7 @@ mochitest-media:
     variants:
         by-test-platform:
             android.*: ['socketprocess']
-            linux1804-64/debug: ['fission', 'serviceworker', 'socketprocess']
+            linux1804-64/debug: ['fission', 'socketprocess']
             default: ['fission', 'socketprocess']
     loopback-video: true
     instance-size: large
diff --git a/taskcluster/ci/test/reftest.yml b/taskcluster/ci/test/reftest.yml
index a92cb3145bc3..6fc196fbc480 100644
--- a/taskcluster/ci/test/reftest.yml
+++ b/taskcluster/ci/test/reftest.yml
@@ -12,7 +12,7 @@ job-defaults:
             default: null
     variants:
         by-test-platform:
-            linux1804-64/debug: ['fission', 'serviceworker']
+            linux1804-64/debug: ['fission']
             default: ['fission']
     fission-tier: 2
     run-on-projects:
diff --git a/taskcluster/ci/test/web-platform.yml b/taskcluster/ci/test/web-platform.yml
index c0039d123eef..77566e4028c4 100644
--- a/taskcluster/ci/test/web-platform.yml
+++ b/taskcluster/ci/test/web-platform.yml
@@ -12,7 +12,7 @@ job-defaults:
             default: 5400
     variants:
         by-test-platform:
-            linux.*64/debug: ['fission', 'serviceworker']
+            linux.*64/debug: ['fission']
             default: ['fission']
     fission-run-on-projects:
         by-test-platform:
diff --git a/taskcluster/ci/test/xpcshell.yml b/taskcluster/ci/test/xpcshell.yml
index 6e25a58083b6..57f79ea17579 100644
--- a/taskcluster/ci/test/xpcshell.yml
+++ b/taskcluster/ci/test/xpcshell.yml
@@ -6,7 +6,7 @@ job-defaults:
     suite: xpcshell
     variants:
         by-test-platform:
-            linux1804-64/debug: ['fission', 'serviceworker']
+            linux1804-64/debug: ['fission']
             default: ['fission']
     target:
         by-test-platform:
diff --git a/taskcluster/taskgraph/transforms/tests.py b/taskcluster/taskgraph/transforms/tests.py
index ac763a539948..2b5b4b448550 100644
--- a/taskcluster/taskgraph/transforms/tests.py
+++ b/taskcluster/taskgraph/transforms/tests.py
@@ -171,20 +171,6 @@ TEST_VARIANTS = {
             },
         },
     },
-    'serviceworker': {
-        'description': "{description} with serviceworker-e10s redesign enabled",
-        'filterfn': runs_on_central,
-        'suffix': 'sw',
-        'replace': {
-            'run-on-projects': ['mozilla-central'],
-        },
-        'merge': {
-            'tier': 2,
-            'mozharness': {
-                'extra-options': ['--setpref="dom.serviceWorkers.parent_intercept=true"'],
-            },
-        },
-    },
     'socketprocess': {
         'description': "{description} with socket process enabled",
         'suffix': 'spi',
diff --git a/testing/mochitest/runtests.py b/testing/mochitest/runtests.py
index 31786f9caba3..4f11a7fa31d6 100644
--- a/testing/mochitest/runtests.py
+++ b/testing/mochitest/runtests.py
@@ -2573,11 +2573,6 @@ toolbar#nav-bar {
             # (https://bugzilla.mozilla.org/show_bug.cgi?id=1577912) this value
             # should by synchronized with the default pref value indicated in
             # StaticPrefList.yaml.
-            #
-            # Currently for automation, the pref defaults to true (but can be
-            # overridden with --setpref).
-            "serviceworker_e10s": self.extraPrefs.get(
-                'dom.serviceWorkers.parent_intercept', True),
 
             "socketprocess_e10s": self.extraPrefs.get(
                 'network.process.enabled', False),
@@ -2827,8 +2822,6 @@ toolbar#nav-bar {
                 self.log.info("runtests.py | Running with e10s: {}".format(options.e10s))
                 self.log.info("runtests.py | Running with fission: {}".format(
                     mozinfo.info.get('fission', False)))
-                self.log.info("runtests.py | Running with serviceworker_e10s: {}".format(
-                    mozinfo.info.get('serviceworker_e10s', False)))
                 self.log.info("runtests.py | Running with socketprocess_e10s: {}".format(
                     mozinfo.info.get('socketprocess_e10s', False)))
                 self.log.info("runtests.py | Running tests: start.\n")