You shouldn't lose anything when you update, and it's important to stay up to date to stay secure online. If you do lose something when you update, let us know and we can help you recover.

You can make a backup copy of the sessionstore.js file that stores the currently open tabs including the pinned (App) tabs.

• https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile
• https://support.mozilla.org/kb/Backing+up+your+information

Hello,

Firefox automatically creates backups of your bookmarks, which can be helpful if your bookmarks are lost or missing. To recover them, follow the instructions below.

1. Use one of these methods to open the Bookmarks Library window:
   • Click the Firefox button to open the menu and click on Bookmarks.
   • Click the Bookmarks menu and click on Show All Bookmarks.
2. At the top of the Library window, click the "Import and Backup" menu and select Restore.
3. Click the date of the bookmark backup you want to recover.
4. In the new window that appears, click OK.
5. Your bookmarks from the selected date should now be restored.

For more information, see the Restore bookmarks from backup or move them to another computer article. For other solutions, see the Recover lost or missing Bookmarks article.

Thank you.

Are bookmarks and tabs the same thing?

No, they're not the same. You really need to place more emphasis on postings made by Contributors / Moderators / Admins who have many, many postings "under their belt".

See:

• https://support.mozilla.org/kb/Tabbed+browsing
• https://support.mozilla.org/kb/how-do-i-use-bookmarks