--- a/taskcluster/ci/test/tests.yml
+++ b/taskcluster/ci/test/tests.yml
@@ -517,18 +517,16 @@ mochitest-a11y:
     suite: mochitest/a11y
     treeherder-symbol: tc-M(a11y)
     loopback-video: true
     e10s: false
     run-on-projects:
         by-test-platform:
             linux64-qr/.*: ['mozilla-central', 'try']
             linux.*-stylo.*: ['autoland', 'mozilla-central', 'try']
-            linux32-stylo/debug: ['try']
-            linux64-stylo/debug: ['try']
             macosx64-stylo/.*: ['mozilla-central', 'try']
             windows7-32-stylo.*: ['autoland', 'mozilla-central', 'try']
             default: built-projects
     mozharness:
         script: desktop_unittest.py
         no-read-buildbot-config: true
         chunked: false
         mochitest-flavor: a11y
@@ -541,18 +539,16 @@ mochitest-a11y:
                 linux.*:
                     - unittests/linux_unittest.py
                     - remove_executables.py
         extra-options:
             - --mochitest-suite=a11y
     tier:
         by-test-platform:
             .*-stylo.*: 2
-            linux32-stylo/debug: 3
-            linux64-stylo/debug: 3
             windows10-64-asan.*: 3
             default: default
 
 mochitest-browser-chrome:
     description: "Mochitest browser-chrome run"
     suite:
         by-test-platform:
             linux64-jsdcov/opt: mochitest/browser-chrome-coverage
@@ -733,18 +729,16 @@ mochitest-clipboard:
     description: "Mochitest clipboard run"
     suite: mochitest/clipboard
     treeherder-symbol: tc-M(cl)
     loopback-video: true
     virtualization: hardware
     instance-size: xlarge
     run-on-projects:
         by-test-platform:
-            linux32-stylo/debug: ['try']
-            linux64-stylo/debug: ['try']
             linux.*-stylo.*: ['autoland', 'mozilla-central', 'try']
             macosx64-stylo/.*: ['mozilla-central', 'try']
             default: built-projects
     worker-type:
         by-test-platform:
             windows7-32.*: buildbot-bridge/buildbot-bridge
             windows8-64.*: buildbot-bridge/buildbot-bridge
             default: null
@@ -778,18 +772,16 @@ mochitest-clipboard:
                         linux.*:
                             - unittests/linux_unittest.py
                             - remove_executables.py
                 extra-options:
                     - --mochitest-suite=plain-clipboard,chrome-clipboard,browser-chrome-clipboard
     tier:
         by-test-platform:
             macosx64-stylo/.*: 2
-            linux32-stylo/debug: 3
-            linux64-stylo/debug: 3
             default: default
 
 mochitest-devtools-chrome:
     description: "Mochitest devtools-chrome run"
     suite:
         by-test-platform:
             linux64-jsdcov/opt: mochitest/mochitest-devtools-chrome-coverage
             default: mochitest/mochitest-devtools-chrome-chunked