--- a/testing/taskcluster/tasks/branches/base_job_flags.yml
+++ b/testing/taskcluster/tasks/branches/base_job_flags.yml
@@ -134,17 +134,17 @@ flags:
     - mochitest-devtools-chrome
     - mochitest-devtools-chrome-e10s
     - mochitest-e10s
     - mochitest-jetpack
     - mochitest-media
     - mochitest-oop
     - mochitest-other
     - mochitest-push
-    #- mochitest-webgl -- disabled per bug 1227637 / bug 1220658
+    - mochitest-webgl
     - mozmill
     - reftest
     - reftest-e10s
     - reftest-ipc
     - reftest-no-accel
     - reftest-sanity-oop
     - web-platform-tests
     - web-platform-tests-e10s

--- a/testing/taskcluster/tasks/branches/try/job_flags.yml
+++ b/testing/taskcluster/tasks/branches/try/job_flags.yml
@@ -165,16 +165,20 @@ tests:
       tasks/builds/b2g_emulator_x86_l_opt.yml:
         task: tasks/tests/b2g_emulator_mochitest.yml
       tasks/builds/b2g_emulator_x86_kk_opt.yml:
         task: tasks/tests/b2g_emulator_mochitest.yml
   mochitest-push:
     allowed_build_tasks:
       tasks/builds/dbg_linux64_clobber.yml:
         task: tasks/tests/fx_linux64_mochitest_push.yml
+  mochitest-webgl:
+    allowed_build_tasks:
+      tasks/builds/dbg_linux64_clobber.yml:
+        task: tasks/tests/fx_linux64_mochitest_gl.yml
   reftest:
     allowed_build_tasks:
       tasks/builds/b2g_emulator_x86_l_opt.yml:
         task: tasks/tests/b2g_emulator_reftest.yml
       tasks/builds/b2g_emulator_x86_kk_opt.yml:
         task: tasks/tests/b2g_emulator_reftest.yml
   web-platform-tests-reftests:
     allowed_build_tasks: