Bug 1674053 - do not toggle the bookmarks toolbar in the middle of the tabswitch test, r=mconley,perftest-reviewers,kimberlythegeek

Differential Revision: https://phabricator.services.mozilla.com/D96263

testing/talos/talos/test.py

@@ -476,6 +476,9 @@ class tabswitch(PageloaderTest):
         "addon.test.tabswitch.urlfile": os.path.join("${talos}", "tests", "tp5o.html"),
         "addon.test.tabswitch.webserver": "${webserver}",
         "addon.test.tabswitch.maxurls": -1,
+        # Avoid the bookmarks toolbar interfering with our measurements.
+        # See bug 1674053 and bug 1675809 for context.
+        "browser.toolbars.bookmarks.visibility": "never",
     }
     unit = "ms"