Hi ShirleyM:
What is your Windows operating system, default browser, and current CCleaner version? Do you recall what CCleaner feature you ran (e.g., Health Check, Custom Clean, etc.) that caused your passwords and/or bookmarks to disappear?
If you are having problems with Firefox after running CCleaner v7.0x see my 10-Jan-2026 comments in nihilistic’s Unwanted changes in Firefox behaviour after running CCleaner. Suej’s 03-Sep-2025 Lost bookmarks includes a few suggested fixes for recovering lost Firefox bookmarks.
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Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.6691 * Firefox v146.0.1 * Microsoft Defender v4.18.25110.6-1.1.25110.1 * Malwarebytes Standard v5.4.6.227-147.0.5453 * Macrium Reflect Free v8.0.7783 * CCleaner Free Portable v6.39.11548 * HDCleaner Portable 64-Bit v2.095