Hi Team, Let me explain how our website is designed first. We have site "A", and inside it we have embedded site "B" via iframe. Site "B" contains various items in local storage based on the operation performed. So, in dev tools, we can see those local storage items under site "B". Now when clicking a link in site "B", it opens the same site ("B") in a new tab which will basically read all its local storage items. But when I open dev tools in this new tab, items of local storage is empty. I have referred this document https://support.mozilla.org/en-US/kb/total-cookie-protection-and-website-breakage-faq Based on this, I disabled Enhanced Tracking Protection by clicking the toggle in the shield panel next to the address bar. Now, I can read items of local storage in new tab after disabling this setting. But, in earlier versions of Firefox I was able to access local storage for the above scenario. This got broke due to the Total Cookie Protection feature. My doubt is that, we are not trying to access local storage of different host. We are only trying to access localstorage of Site "B" in a different tab. May I know if there is a way to fix this other than disabling Enhanced tracking protection ? Let us know if any code fix is available as well.