I sought without answer to see how to PREVENT restoring previous sessions, freezing my computer because FF did not clear previous sessions, internet access freezing when social media sites weren't cleared, as they used to be. And then, reading the solution on, how to access restoresession options, I come upon about:config and search browser.session I see the problem. Instead of setting options to clear previous history, FF now has uncountable options which - hide browsers I've deletes, like Bing - maintain restoring sessions up to 5, 10, 32 times, even though I've set the option to never - keep data I wanted deleted, in Top sites, in pocket, in other options - set Google as the default translator even though I've chosen not to use it I am seriously disappointed in Firefox and Mozilla. I have used it since I found it one- two ? decades ago because it WASN'T wired into the top-heavy, data-excessive, intrusive-spying behemoths of Google and Microsoft. Did Google buy you out, or something? I do notice that the wonderful creative-commons data options have been swallowed up by those icons of not-for-profit and community sharing, google-android, every for-profit phone companies (ATT, Verizon,etc.) How sad and ironic. I found my solution was, select 0 for many, many browser.?? options and deleting the history I found in various switches. Posting this to share my disillusion.