So, here’s a simple method to back up all your bookmark folders and websites, which will be done, while you are reading this blog post.
Go to Bookmarks in the menu bar, then click on Organize Bookmarks…, Now click on Import and Backup drop-down menu. Now there are two methods to follow, and I recommend you to do both.
1. Click on Backup…now save the file(JSON) in a safe place, OTHER than the drive where you have system files. So that means you should not place this back up file in either Desktop or My Documents.
Save it safely in any other drive (D: or E:), or better save it on a disk and also somewhere safe online like your email.
When you want these files to be uploaded to any new Firefox:
Click on Bookmarks
then click on “Organize Bookmarks…”
now click on Import and Backup, then click on Restore, and finally click on “Select File”, and upload the “.JSON” file.
2. Second method creates a file, which is quite easy to access from anywhere and share it with your friends too, and moreover works even without Firefox, this is because the output file is simple a HTML file, with all your bookmarked website as hyperlinks.