Firefox is running slow. Problem goes away in Safemode, reset did not work.

I keep getting Firefox is running slow message. Starting in Safemode seems to help. How do I determine what is causing the slow down.

Try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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