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.

Question

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.

Answer 1

Dear Colbabomb; thankyou for your links.
So far, I looked at your first solution, Revo Uninstaller and it gives you a 30 free trial. Ergo, it will eventually cost money so I'm leery of using those kinds of programs in general, meaning most "free trials" have unwanted strings attached and often are big probs to get rid of later. Perhaps you can assure me that it is easy and very user friendly, before I proceed. And I already ran malwarebytes and it found nothing tho the program still can't be uninstalled. I downloaded Adw Cleaner and during the install, my Norton's security popped up and warned that there were (low risk) threats with two of their "other offers" and i hadn't even actually clicked to agree either of them. Nonetheless, Norton warned me against the "lyrics finder" and "deal ply." In fact, there was a box already with an x in it, saying that you are accepting deal ply if you x on "next." Well, except I unchecked that box before clicking on next, yet when it went to fully install, it still showed that it was adding itself; so, just before the install was 100% completed, I had to abort the whole thing. I really do hope your other suggestions are programs that you personally know that they don't try and trick you. But right now, I would not suggest Adw Cleaner to anyone. I even read the fine print about what they will try and install and how to decline and it still tried sticking stuff on that i believed I had declined. Anyways, i have to leave now, shall pick up later this evening, if my pc is still functioning.