Hi Keyboard_Zombie:
If you cannot restore your most recent bookmark backup as suggested in my 04-Sep-2025 post <above> then see my 07-Jan-2026 post in suej’s Lost bookmarks about ways to repair your existing places.sqlite and/or favicons.sqlite files.
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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 Premium v5.4.5.226-146.0.5441 * Macrium Reflect Free v8.0.7783 * CCleaner Free Portable v6.39.11548 * HDCleaner Portable 64-Bit v2.095