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.

What addons in use? Is "Studies" on?

Sorry missed the link provided. There is no feed. Alternatively in Inoreader (paid version) for instance (and other sources) you can monitor the page for changes.

https://lemmy.ml/feeds/c/firefox.xml?sort=Active

See "Manage Exceptions" (Privacy in Settings).
Typically, when accessing an "exception web page" 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

Could be usefull at the very least as a history trail (as "History" proper is bloated with garbage, unfortunately)