The only way would be to use Firefox Sync and manage the bookmarks on desktop.

Thanks, by deckstop I assume you include anotepad or a laptop ?

Thanks, by deckstop I assume you include anotepad or a laptop ?

Something that runs Microsoft Windows, Apple OS X or Linux.

Many thanks. Will update the post later

It works. After creating Firefox sync account and adding devices, go to bookmarks or PC or NP, find mobile bookmarks, sort by name, organse, select all, right click and delete all. When your moblie is signed into sync deletion occurs. Thanks for your advice