Librewolf

You can go to about:config and set extensions.pocket.enabled to false. After that you need to restart Firefox (closing it and opening it).

Check out one of the privacy-focused Firefox forks like LibreWolf, IceCat, or Waterfox. All three disable/rip out pocket by default, I believe, and reduce number of situations they phone home to Mozilla or Google. Memory savings are minimal though.

Librewolf for Linux. Fennec and Mull for Android

Librewolf is one of the more prominent ones these days. There’s also Waterfox, which is based on an ESR (so, older) version of Firefox and likewise fits the bill.

Libreworlf. It also strengthens Firefox privacy features with flags and disbles the Firefox telemetry

@[email protected] Librewolf is probably the best firefox alternative/fork that removes unneeded features and improves your privacy.

https://librewolf.net/

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You can use this guide to configure Firefox for privacy.