Bug 1626522 - [raptor] Enable extension logging for Raptor webext jobs in CI. r=perftest-reviewers,sparky

Differential Revision: https://phabricator.services.mozilla.com/D69927

--HG--
extra : moz-landing-system : lando

taskcluster/ci/test/raptor.yml

@@ -51,6 +51,10 @@ job-defaults:
                     - raptor/linux64_config_taskcluster.py
                 default:
                     - raptor/linux_config.py
+        extra-options:
+            # Bug 1626522: Temporarily enable extension logging for
+            # an easier investigation of intermittents on mobile devices
+            - --setpref=extensions.logging.enabled=true
     fission-run-on-projects:
         by-test-platform:
             linux64-shippable-qr/opt: ['mozilla-central']