Go to any site (eg weather). In hamburger menu (bottom right) select Add To Home Screen. Launch Firefox using that Home Screen icon.

Install Onetab

See https://firefox-source-docs.mozilla.org/browser/tabunloader/

You’re still using the previous user name? … otherwise problematic.

SmartTubeNext

Create a cookie exception (to prevent deletion)
When accessing a site you’d (from address bar/^i) open permissions and specifically ALLOW cookies for that site.

Fix prob available Mon according to employee engaged on it