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SpokenTruth said:
Start Firefox with add-ons disabled. Click the 3 bars in the top right, click the Question icon (help menu), click Restart with Add-Ons Disabled. If you don't experience the same problem, one of your add-ons is the culprit. Then just us a process of elimination to find out which one it is.

 This is the best advice. Start with this first. Most of the time, it is a rogue add-on.