Bug 1880063: Explicitly enable popover for role tests so that browser_minimumRole.js runs correctly on beta where popover is still disabled. r=morgan

Differential Revision: https://phabricator.services.mozilla.com/D201802

accessible/tests/browser/role/browser.toml

@@ -6,7 +6,10 @@ support-files = [
   "!/accessible/tests/mochitest/*.js",
   "!/accessible/tests/browser/*.mjs",
 ]
-prefs = ["javascript.options.asyncstack_capture_debuggee_only=false"]
+prefs = [
+  "javascript.options.asyncstack_capture_debuggee_only=false",
+  "dom.element.popover.enabled=true"
+]
 
 ["browser_computedARIARole.js"]
 ["browser_minimumRole.js"]