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Firefox 56 jittery on High Sierra

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Ever since upgrading to High Sierra, Firefox 56 has been acting very strange. 1. Hangs during tab switching 2. Pauses during typing 3. Frequent beach ball appearance 4. Slow in responding to app switching

All other apps & browsers on my mac are perfectly fine (Chrome, Canary, Safari, Opera) I have reset cache, profile folder and addons