I have got a new computer. When I opened firefox and was checking bookmarks wre there (they were) I mistakenly opted to delete them all. This has since synced with my mobile app so disappeared from there too. When I follow all the instructions to restore old bookmakrs I can't because there is no date earlier than they say I started using the new computer to choose. There are no back up files on my new computer either. I thought I might be able to restore using my mobile - but there is no option to do this on the app. It's not life threateneing but it is a huge pain to lose a big list of bookmarks. Can anyone help?