Firefox History & X Rated Most Visited! Security Issue?

[SusieJazz]

Hi - I recently uploaded Morzilla Firefox onto my Mac (about three weeks ago at the beginning of June) and then an update more recently a few days ago. Yesterday morning I looked for the first time in the Most Visited tab for my bank site as that was all I had used Firefox for and found instead a whole string of different internet Gay porn sites!!! I investigated further by looking to see when exactly these sites had been viewed and they all said February, four months before I had even uploaded Firefox!!! Not only that, when I checked the other history it told me I had uploaded Firefox itself in April and not June!!!
Can anyone tell me please where or how these sites would of made their way into the most viewed folder... Do I have a security concern? If someone had uploaded Firefox in February without my knowing and then deleted it would the history still remain?
Confused
London

[osprey4]

Hi Susiejazz,

Welcome to TechIMO.

It's certainly possible that someone previously installed Firefox, then uninstalled it but left the history intact.

[Taxmancometh]

Or they ran a portable version and somehow the history crossed over to the install.