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Firefox starts with old tabs and windows I had visited ages ago, not a new blank window. It is opening up a tab containing a credit card transaction I had completed last week, so I am worried about the security risks your browser is posing right now.
Few times a week, ff opens after boot with random tabs from history open. But today it kept opening the same set of windows (not tabs) from random points of time from history. It stopped after I closed 4 of them and browsed a bit with the last and closed it with tabs open. Then it resumed opening the previously saved tabs. The usual situation with tabs occurs generally after I close firefox with no tabs and no websites loaded and I shut down the computer. I do have a large amount of history, I generally clear only sensitive sites from history by searching and clicking forget this site.