Bookmarks not being saved

My bookmarks are not being saved anymore. When I try creating a new bookmark, it often simply doesn't work. If I try in troubleshoot mode, it sometimes does, and sometimes doesn't, I have no idea why. Creating new folders, or moving bookmarks, or deleting existing bookmarks is also blocked. In the backup files, I can see the last successful saving of my bookmarks is a month ago, though I'm using Firefox on a daily basis and I can also see that, previously, saves where every couple of days. I found a recent json file named "bookmarks" in C:\Users\(me)\AppData\Roaming\Mozilla\Firefox\Profiles\64cqek8b.default-release-1768329501903\weave\failed The file content : {"ids":[]} And nothing else. There's also a squilte file named "bookmarks" in C:\Users\(me)\AppData\Roaming\Mozilla\Firefox\Profiles\64cqek8b.default-release-1768329501903\weave The file is dated of today and its size is 1,47 Mo. Which, I believe, shows the data actually exists... but fails to save into json format for some reason. I hope all needed informations are there, but please ask me if something is missing. Thank you for reading!