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firefox.exe on Windows startup - maxing out disk usage, slowing down computer

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Davox
Davox
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When I look in Task Manager > Startup, Firefox isn't there. When I go to Performance > Resource Monitor > Disk, it shows firefox.exe taking the top three lines when sorting by Read (B/sec). It's just grinding my computer and I'm not seeing how it's even starting up after logging into Windows.

How do I find out why firefox.exe is starting with Windows (login?), and how to stop it? I only use it intermittently for certain things. I don't need it running in the background just because I booted up or started Windows.

I have the latest (auto-updating) versions of Windows 10 Pro and Firefox.

When I look in Task Manager > Startup, Firefox isn't there. When I go to Performance > Resource Monitor > Disk, it shows firefox.exe taking the top three lines when sorting by Read (B/sec). It's just grinding my computer and I'm not seeing how it's even starting up after logging into Windows. How do I find out why firefox.exe is starting with Windows (login?), and how to stop it? I only use it intermittently for certain things. I don't need it running in the background just because I booted up or started Windows. I have the latest (auto-updating) versions of Windows 10 Pro and Firefox.