Hi Jean, on Firefox for Android, tap the menu button, then History. There should be a magnifying glass icon at the top of the History list you can tap to open a search bar. Is that what you meant? If your question is about Firefox on Windows/Mac/Linux, you could try the Sidebar (Ctrl+H, or on Mac, Command+H) or the Library window (menu > History > Manage History or on the menu bar History > Show All History). Success?