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Lost previous Firefox when new library established. Can't get back to original with all my info.

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Apple tech's had me build a new library on my computer. In doing this all my applications have had to be rebuilt. When I started Firefox, it set up a new FF, so I don't know where all my information (Bookmarks, etc) went from the old FF. How do I re-establish my old FF or get the new one to import my previous info?

Apple tech's had me build a new library on my computer. In doing this all my applications have had to be rebuilt. When I started Firefox, it set up a new FF, so I don't know where all my information (Bookmarks, etc) went from the old FF. How do I re-establish my old FF or get the new one to import my previous info?

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Check this

Firefox keep all your information in Profile, restore the profile from your old firefox

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Hi: I found both of these links very confusing and not necessarily related to my problem. As mentioned previously. What happened was not due to anything Mozilla did. Apple tech's had me rebuild my computers library. In doing so, all my programs including Firefox lost all their original data. If Firefox has my Bookmarks backed up somewhere besides my computer, then it should be possible to retrieve them. Right now, Firefox went back to something akin to a brand new version, with no history, even when I go into files. If there is a previous file somewhere, I'm not sure where to find it. I had lots of research in Bookmarks, so would very much like to get that all back again. I need very specific guidelines to do this, as I am Not a tech person. Please let me know. Thank you. C.R.N.