¿Has encontrado places.sqlite archivo?

Firefox uses two locations in the hidden "AppData" location for the Firefox profile folder. One location in "AppData\Roaming" for personal data like bookmarks and logins and another location in "AppData\Local" for temporary files like the disk cache, so make sure to look in the correct location.

Primary location used for the main profile that keeps your personal data (Root Directory on about:profiles).

• C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>

Lo que he encontrado es la carpeta "001fvi1t.default-release-1702384089112" que por la fecha y peso debe contener los archivos de mi perfil con marcadores y demás pero ni se abrirla ni qué hacer con ella

Earlier thread for reference: https://support.mozilla.org/questions/1482377

Hi Juan, inside that folder you found, can you find a folder named

bookmarkbackups

The bookmarkbackups folder usually contains numerous files. Each file should have its creation date as part of the file name. For example:

bookmarks-2024-12-30_582_gibberish=.jsonlz4

These files are compressed using LZ4, so they cannot be immediately read. However, you can use them to replace your current bookmarks with the ones in a backup file, using the steps in the following article:

Restore bookmarks from backup or move them to another computer

You need to use "Choose file" to point Firefox to the old file, so you might want to copy/paste the file to your Windows desktop for easier access.