ihatesillygibsive spent 1 hour trying to figure out where to put sillygibs=off.
Modules are used in presets to set quality levels and can also be used in a tf/cfg/user/modules.cfg file to customize your config easily without searching for individual console variable values. Just put your desired module level in user/modules.cfg. For example, textures=high
You can select modules in game using the console. Just enter the module you’d like to select with a = before it. This selection will persist even after a restart!
For example, you could enter =textures=high to set your textures to high, and to have it set to high in future launches as well.
I don't think it could be explained any better, I'm genuinely curious how you managed to miss that for an hour.