How to force a link to download a file instead of opening it on the browser?

[Neus]

Hello,
On my website I have a button to download my book in EPUB format. You can see it here: https://imwithlorac.com/get-the-book/#downloads
In the other browsers the file is downloaded, but in Mozilla it opens directly in the browser and unless you have installed in Mozilla an EPUB reader, a page with the raw file opens which does not make any sense. It's the same with the MOBI format. On the other hand, with the PDF format the PDF book opens because Mozilla can open PDF files.
What I want is that it doesn't open, but that it downloads when people click on the link.
I've done this: https://www.rtcom.me/epub-e-mobi-su-wordpress/ I've purged the LiteSpeed cache and still doesn't work.
Any ideas?
Thanks.

 

[Pong]

It is not something from server end, but only a setting from your firefox browser,
https://prnt.sc/u15xto
basically you can choose save file or open with, if you have some previous incorrect setting as open with, you should clear it. you can google it yourself for firefox.

 

[Neus]

This is a link for my readers to download the book, so I would want that when they click on the link, the file downloads directly, without them changing the settings of Firefox. Thank you.

 

[NiteWave]

I've done this: https://www.rtcom.me/epub-e-mobi-su-wordpress/ I've purged the LiteSpeed cache and still doesn't work.

this should work, not sure why it doesn't work.

you can try same method in .htaccess

RewriteRule \.epub$ - [T=application/octet-stream]

to see if it'll work.

please refer
https://httpd.apache.org/docs/current/rewrite/flags.html#flag_t
for above 'T' flag

 

[Neus]

Solved!
I had the files in a subdomain. I took them out of there and put them in a folder. It's been working ever since. Now in Firefox a popup window opens asking you if you want to open the file or save it.
Thank you.