--- a/taskcluster/ci/test/tests.yml
+++ b/taskcluster/ci/test/tests.yml
@@ -5,16 +5,20 @@
 
 # Note that these are in lexical order
 
 cppunit:
     description: "CPP Unit Tests"
     suite: cppunittest
     treeherder-symbol: tc(Cpp)
     e10s: false
+    run-on-projects:
+        by-test-platform:
+            windows.*: ['mozilla-central', 'try']
+            default: ['all']
     mozharness:
         by-test-platform:
             android.*:
                 script: android_emulator_unittest.py
                 no-read-buildbot-config: true
                 config:
                     - android/androidarm_4_3.py
                     - remove_executables.py
@@ -85,16 +89,20 @@ crashtest:
 
 external-media-tests:
     description: "External Media Test run"
     suite: external-media-tests
     treeherder-symbol: tc-VP(b-m)
     e10s: false
     tier: 2
     max-run-time: 5400
+    run-on-projects:
+        by-test-platform:
+            windows.*: ['mozilla-central', 'try']
+            default: ['all']
     mozharness:
         script: firefox_media_tests_taskcluster.py
         config:
             by-test-platform:
                 windows.*:
                     - mediatests/taskcluster_windows_config.py
                 default:
                     - mediatests/taskcluster_posix_config.py
@@ -198,16 +206,20 @@ jsreftest:
             # Bug 1321782
             windows.*: false
             android.*: false
             default: both
     max-run-time:
         by-test-platform:
             android.*: 7200
             default: 3600
+    run-on-projects:
+        by-test-platform:
+            windows.*: ['mozilla-central', 'try']
+            default: ['all']
     mozharness:
         by-test-platform:
             android.*:
                 script: android_emulator_unittest.py
                 no-read-buildbot-config: true
                 config:
                     - android/androidarm_4_3.py
                     - remove_executables.py
@@ -519,16 +531,17 @@ mochitest-devtools-chrome:
     chunks:
         by-test-platform:
             windows.*: 8
             default: 10
     run-on-projects:
         by-test-platform:
             linux64-ccov/opt: []
             linux64-jsdcov/opt: []
+            windows.*: ['mozilla-central', 'try']
             default: ['all']
     e10s:
         by-test-platform:
             linux64-ccov/opt: false
             linux64-jsdcov/opt: false
             # Bug 1304433: mochitest-devtools-chrome (e10s) not greened on windows
             windows.*: false
             default: both
@@ -603,16 +616,20 @@ mochitest-gpu:
 
 mochitest-jetpack:
     description: "Mochitest jetpack run"
     suite: mochitest/jetpack-package
     treeherder-symbol: tc-M(JP)
     loopback-video: true
     e10s: false
     max-run-time: 5400
+    run-on-projects:
+        by-test-platform:
+            windows.*: ['mozilla-central', 'try']
+            default: ['all']
     mozharness:
         script: desktop_unittest.py
         no-read-buildbot-config: true
         chunked: true
         config:
             by-test-platform:
                 windows.*:
                     - unittests/win_taskcluster_unittest.py
@@ -1057,16 +1074,20 @@ web-platform-tests:
     chunks:
       by-test-platform:
         macosx.*: 5
         default: 12
     max-run-time: 7200
     instance-size: xlarge
     docker-image: {"in-tree": "desktop1604-test"}
     checkout: true
+    run-on-projects:
+        by-test-platform:
+            windows.*: ['mozilla-central', 'try']
+            default: ['all']
     mozharness:
         script: web_platform_tests.py
         no-read-buildbot-config: true
         config:
             by-test-platform:
                 windows.*:
                     - web_platform_tests/prod_config_windows_taskcluster.py
                 default:
@@ -1083,16 +1104,20 @@ web-platform-tests-reftests:
     instance-size: xlarge
     e10s:
         by-test-platform:
             # Bug 1304438
             windows.*: false
             default: both
     docker-image: {"in-tree": "desktop1604-test"}
     checkout: true
+    run-on-projects:
+        by-test-platform:
+            windows.*: ['mozilla-central', 'try']
+            default: ['all']
     mozharness:
         script: web_platform_tests.py
         no-read-buildbot-config: true
         config:
             by-test-platform:
                 windows.*:
                     - web_platform_tests/prod_config_windows_taskcluster.py
                 default: