LibreWolf strips Firefox of telemetry, adds privacy and security tweaks, disables Pocket, and ships with uBlock Origin by default. It's basically Firefox with hardened defaults and no Mozilla connections.

If Firefox ever collapsed, libreWolf couldn't continue independently long-term, they rely entirely on Firefox’s upstream codebase. They don’t maintain their own engine (Gecko), so they'd lose the foundation their browser is built on. It'd be the end unless a fork of Gecko emerged.