How do I import bookmarks from Opera 34 to Firefox 43? I just don't seem to be able to find this info. Any help will be greatly appreciated.
Perhaps try exporting the Opera bookmarks to an HTML file, then Firefox will be able to import them.
Or click on Bookmarks -> Show All Bookmarks -> Import and Backup -> Import Data from Another Browser
Or the keyboard shortcut for the above is Ctrl+Shift+B then Alt+I then A
I don't have Opera on my computer but every browser I do have installed is listed there so hopefully Opera will show in your list of choices.