Hi Laurence_CCleaner:
See my 10-Jan-2026 post in nihilistic’s Unwanted changes in Firefox behaviour after running CCleaner, which includes a partial list of topics started by users who lost their Firefox bookmarks and/or had other Firefox Profile files (e.g., places.sqlite, favicons.sqlite, etc.) corrupted after upgrading to CCleaner v7.x.
NOTE to users: Suej’s 03-Sep-2025 Lost bookmarks includes a few suggestions for recovering Firefox bookmarks lost or damaged after running CCleaner v7.x.
According to your 21-Jan-2026 post in Pianoman’s CCleaner 7 constantly hanging Avast / Piriform has already identified a bug that can cause Health Check to hang when it attempts to clean Firefox that will hopefully be fixed in the upcoming CCleaner v7.05 release. Is it possible that at least some of these Firefox problems are related to the new Profile Manager that began a gradual rollout with Firefox 144.0.0 (14-Oct-2025 release notes here)? See the 14-Sep-2025 ghacks article Firefox 144.0 is out with new profile management, tab group improvements, and security fixes and the Mozilla support article Manage Firefox Profiles.
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Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.6809 * Firefox v147.0.2 * Microsoft Defender v4.18.25110.6-1.1.25110.1 * Malwarebytes Standard v5.4.7.229-148.0.5470 * Macrium Reflect Free v8.0.7783 * CCleaner Free Portable v6.39.11548 * HDCleaner Portable 64-Bit v2.095