Not fully. You can prevent the main UI window from opening at boot, but the background services (which include components that might spawn fsmainui.exe for alerts) will still run. Look in F-Secure Settings → General → Startup behavior and disable "Show splash screen" or "Open main view at startup."
This article provides a comprehensive overview of what fsmainui.exe is, why it is on your computer, its safety, and how to handle common issues like high CPU usage. What is fsmainui.exe?
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