FFlagDisablePostFx

People paste "FFlagDisablePostFx" when looking up Bloxstrap FastFlags. Roblox now allowlists flags; most custom values are ignored.

How-to • Updated 17 October 2026 • 1 min read

Bloxstrap requires the Microsoft .NET 6 Desktop Runtime to be installed

Discord Rich Presence shares the game you are playing with friends.

FFlagDisablePostFx used to be set through Bloxstrap's FastFlag editor. Bloxstrap 2.10 removed that editor after Roblox's allowlist.

If a pasted JSON does nothing, the flag is not on the allowlist — not a Bloxstrap bug.

Installer: /download.

Frequently asked questions

Is FFlagDisablePostFx a cheat?

It is a client setting name. Roblox now ignores most local overrides.

Bloxstrap is an alternative launcher for Roblox with extra features and mods.