Hi, it might be worth temporarily disabling Classic Shell.

If that doesn't help, you can try this: 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.

• 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!

Hello

I tried the solution mentioned in below Link but I still can not find any of my old saved Bookmarks. I can't see an old Profile anywhere. https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

Sounds that you have memory (DRAM) problems with your computer.

• Memtest86+ - Advanced Memory Diagnostic Tool: http://www.memtest.org/

Do you have an "Old Firefox Data" folder on the desktop in case you used the Firefox Refresh feature?

Do you have any profiles in the default location?

You can use this button to go to the current Firefox profile folder:

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

Go up one level to the Mozilla\Firefox\Profiles\ folder.

• C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\

"AppData" (XP: Application Data; Mac: ~/Library; Linux: ~/.mozilla) is a hidden folder.

• http://kb.mozillazine.org/Show_hidden_files_and_folders

Hello cor-el

Sorry about the delayed response.

I don't know how to utilize the Memory test link you provided.

The Profiles in the default location are all from July 1st onwards, which is after I lost my bookmarks.

I don't have the C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\ folder

• But I did manage to turn on the show hidden files and folders.

• After turning this on I then did what is mentioned in the 1st link of Scribe's post.

• I then accessed the Run dialog as mentioned in Scribe's link , then typed " %APPDATA%\Mozilla\Firefox\Profiles\ " .

• 2 folders then appeared. 1 had bookmarks from July 2016 and the other had Bookmarks from June 2016 . I lost all my Bookmarks on July 1st or the day before.

• Now how do I access the bookmarks from June 2016? The folder's name is " 4r79zr4y.default "

• When I open the above Folder and then open the " bookmarkbackups " folder , all the files are JSONLZ4 . I tried to open it with Windows Explorer but it won't open. Opening with Notepad just shows some unintelligible script.

Thanks

I tried to open the JSONLZ4 file with the method shown in below video tutorial but it doesn't work https://www.youtube.com/watch?v=kBuT1tc7LBU