When I remember and notice, I open link in new tab to retain my history.
This started happening several months ago and can be frustrating when doing deep searches.

 I hope there is a security setting I am missing that is allowing Facebook access to my browsing history!

Thanks for your help!

Whenever I click on a web search link that goes to Facebook, my Firefox browser back button is cleared. This makes it impossible to go back to my original search easily. When I remember and notice, I open link in new tab to retain my history. This started happening several months ago and can be frustrating when doing deep searches. I hope there is a security setting I am missing that is allowing Facebook access to my browsing history! Thanks for your help!