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Al intentar realizar una copia de seguridad del certificado de firma y tras establecer el archivo de destino y contraseñas, al clicar en guardar aparece una pequeña ventana "error desconocido impide descargar"

When I download an image, the downloaded file weighs 146 bytes and no program can open it, I have to reload the page and redownload the file to get a readable file, always the corrupted files weigh 146 bytes, sometimes I have to retry the download several times, and it happens irregularly, sometimes with more than 10 consecutive files and sometimes a week without an error, it happens in different pages, but more frequently in pixiv.net.

Image 001: Corrupted files in the recycle bin and information about one of the corrupted files. Image 002: Readable file downloaded after two attempts.

Translated with DeepL.com (free version)

I've wanted to save a pic from internet, everything went well until I realized the download did not even had started. There is no advice, it just does nothing when trying to download anything,

Since yesterday, and without doing anything in particular (apparently) all ebooks or other files try to download, show as "failed" in the Firefox download area. I am using Ubuntu 25.04 for some days and beyond that I have not had other problems. I have deactivated my Add Ons and I have tried changing the restrictive settings to Firefox Standard Settings... and nothing. I don't know what the error can be.