javascript.options.asmjs

was inactive, is default false since 148 and is pretty much obsolete
- https://spidermonkey.dev/blog/2026/05/20/saying-goodbye-to-asmjs.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=2002635

scratchpad-scripts/arkenfox-cleanup.js

@@ -84,6 +84,7 @@
     'browser.urlbar.fakespot.featureGate',
     'browser.urlbar.quicksuggest.enabled',
     'browser.urlbar.suggest.quicksuggest.nonsponsored',
+    'javascript.options.asmjs',
     'privacy.userContext.enabled',
     'privacy.userContext.ui.enabled',
     'security.OCSP.enabled',