Irwin8100's method works, but not well for me. I have many bookmarks accumulated over the years and nicely organized in folders and sub-folders. This method categorizes them by sub-folder, but the sub-folders are in some order that's not immediately obvious - definitely not alphabetical, nor chronological.

How do I enable the bookmark importer so I can import my FireFox bookmarks. I exported them to both a .json and an HTML file and put those in various Opera sub-folders. I have the book marks toolbar enabled.

I see a similar thread was closed, but just wanted to confirm I'm switching to Opera because of Mozilla's intolerance.