Importing Firefox bookmarks

First time trying Brave replacing Vivaldi which will no longer work in my EOL version of UBUNTU 16.04
Brave seems to work OK until I try to import bookmarks from Firefox 88.0
I see others have had this problem - Firefox (or any other browser) does not show in the ‘import bookmarks and settings’ drop down menu.
I installed Brave from the Ubuntu repository -
Version 1.34.80 Chromium: 97.0.4692.71 (64-bit)
Hope there is a solution. Thanks