Show the issue. Where are you downloading from and what happens when you try to open it. What are you trying to open the office document with?

Windows 10 The .docx files are downloaded from a internal web app (http). After Allow download, when i try to open them in Microsoft Word i get the message: "it cannot be opened because there are problems in the content the file is damaged and impossible to open"

For a 13 Kb file it results in a 6 Kb file, for example.

Does it work if you change dom.block_download_insecure to false in about:config then restart the browser?

Yes it works. I know your solution, but as you said in 2023 it's a temporarily one. We hope an update will appear soon. Thank you!

Hello

Take a look https://connect.mozilla.org/t5/discussions/unsecure-website-download-not-working/td-p/55458

https://www.mozilla.org/en-US/firefox/125.0.2/releasenotes/