Turning off Firefox updates is not recommended. Malicious people are always finding new ways to exploit browsers. Keeping Firefox up-to-date will give you the best protection against security and privacy vulnerabilities.

Wesley you clearly could not read the question! But let me help you! The question was not about whether you think user should turn his/her updates, but how to do this! See? I think you have problems in info comprehension ("malicious people" killed me tbh)