Hi

If you want to back up your saved usernames and passwords or move them to a different application, the Firefox password management feature allows you to export this data to a .csv (comma separated values) file.

More info Export login data from Firefox

To import it into the brave browser you should ask in the brave support forum

Although that still didn't work in iPad iOS, I gave up and did exactly that in my Linux laptop, transferred it to the Linux Brave there, and synced my Brave and Firefox accounts.

I think it is a "roadblock workaround" solution to iOS being unusable this directly.

It in fact started because of another problem in iOS, a system prompt for passwords that offered choices of Brave and Safari, but not Firefox.

(Specifically, an ISP account and password to use hotspots, which I had saved only in Firefox.)

(Apple doesn't listen, but -- Another reason for me to continue preferring Linux devices over iOS devices.)