Hi, I'm not familiar with Mac, so apologies if any details aren't quite right.

First open bookmarks > Show All Bookmarks > Import and Backup >Restore, and see if you have a backup there.

If not, please see - Profiles - Where Firefox stores your bookmarks, passwords and other user data.

And Recover important data from an old profile.

If your question is resolved by this or another answer, please take a minute to let us know. Thank you.

Look on your desktop. Do you see a folder called; Old Firefox?

https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

thankyou scribe_UK

1) I did this as you suggested: First open bookmarks > Show All Bookmarks > Import and Backup >Restore, and see if you have a backup there.

2) All the backups of my bookmarks are there. My bookmarks get backed up on shutdown fx, which i typically do every day or every 2nd day. So I copied the file of the latest on my harddrive. Then I restored. Just in case something went wrong.

3) Thats the good news. The bad news > the restore crashed 3 times before it fully restored. When I say crashed.. started giving js errors.. so i waited and let the script continue raather than stop it. After about 1hr and a bit it finally finished. > all the bookmarks lost all their icons. So then I loaded the add-on fav icon reloader. And that has been refreshing icons. Took about 2hr to refresh.

so i am sorted now from bookmarks perspective. But upgrading to Fx always makes me nervous when things like this happen. Not pretty.

secondly, since the upgrade, Fx has gone back to slow slow speed that it was running before i created a fresh new install of yosemite like 5 months ago and fresh profile. So something tells me upgrading fx is only to be done at very last resort. As looks like i have slow FX now, unless i want to spend even more time, recreating the Fx profile.

Thankyou for your help.

These add-ons can be a great help by backing up and restoring Firefox

FEBE (Firefox Environment Backup Extension) {web link} FEBE allows you to quickly and easily backup your Firefox extensions, history, passwords, and more. In fact, it goes beyond just backing up -- It will actually rebuild your saved files individually into installable .xpi files. It will also make backup of files that you choose.

OPIE {web link} Import/Export extension preferences