During the past two weeks, I added annotations to three PDF files using Firefox, saving the file each time I added an annotation. After Firefox updated to v109.0 on a Win10 computer, I discovered that the annotations were gone in the first 2 PDFs. Does anyone have any insights into what happened and how to recover the annotations? I did try copying the PDFs to a computer that was running Firefox v108.0.2, but the annotations were still not visible.