I doubt it tbh.

For blender it's fine, but for browser engines it's different because of their sheer size, complexity, need to adhere and collaborate with others to form web standards, need for security experts, day one vulnerability patches, etc.

If Mozilla dies, random volunteers or existing projects like LibreWolf can't just pick up the slack.

Volunteers can't run a modern web engine, it takes hundreds of millions per year to upkeep.

There's a reason why we're down to just Google, Apple, and Mozilla. Nobody wants to foot the massive bill unless they have a damn good reason for doing so.

It's probably more expensive to maintain a browser engine than a full operating system at this point. It's truly insane how large and costly they are.