Hi RIAD_EL_ASHREY, does your Firefox usually restore tabs automatically? In that that didn't work, please check whether either of these are available (not hidden or grayed out):

• "3-bar" menu button > Restore Previous Session
• (menu bar) History > Restore Previous Session

If they are missing or grayed, check either:

• "3-bar" menu button > Library > History > Recently Closed Windows
• "Library" toolbar button > History > Recently Closed Windows
• (menu bar) History > Recently Closed Windows

There's also a Recently Closed Tabs list for each window.

Does that help?

If not:

Firefox creates numerous session history files, but because session history is only for the immediately previous session, it is unfortunately too easy to lose it. Could you start by making a backup of your existing session history files? Here's how:

Do not exit Firefox, or if you closed it, don't re-open it.

(1) To open your profile folder...

If Firefox is still running:

You can open your current Firefox settings (AKA Firefox profile) folder using either

• "3-bar" menu button > "?" Help > Troubleshooting Information
• (menu bar) Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter

In the first table on the page, click the "Open Folder" button.

If Firefox is closed:

Type or paste the following into the Windows Run dialog or the system search box and press Enter to launch Windows Explorer:

%APPDATA%\Mozilla\Firefox\Profiles

In that folder, do you see a semi-randomly-named folder? If so, click into it. If you find multiple such folders, find the one that was most recently updated.

(2) Copy out session history files

In your profile folder, double-click into the sessionstore-backups folder. Save all files here to a safe location such as your Documents folder.

(3) What files did you find?

The kinds of files you may find among your sessionstore files are:

• recovery.jsonlz4: the windows and tabs in your currently live Firefox session (or, if Firefox crashed at the last shutdown and is still closed, your last session)
• recovery.baklz4: a backup copy of recovery.jsonlz4
• previous.jsonlz4: the windows and tabs in your last Firefox session
• upgrade.jsonlz4-build_id: the windows and tabs in the Firefox session that was live at the time of your last update

Could you take a look at what you have and the date/time of the various files to see whether you think any of them would have the missing tabs?

To preview the contents of a file, you can drag and drop it onto this page, then click Scrounge URLs: https://www.jeffersonscher.com/ffu/scrounger.html

That tool is on my site, so please let me know if it doesn't work for you.

There was update on 28-July-2020 I think this make the problem

Hi I opened this folder and found some files

    recovery.jsonlz4: the windows and tabs in your currently live Firefox session (or, if Firefox crashed at the last shutdown and is still closed, your last session)
   recovery.baklz4: a backup copy of recovery.jsonlz4
   previous.jsonlz4: the windows and tabs in your last Firefox session
   upgrade.jsonlz4-build_id: the windows and tabs in the Firefox session that was live at the time of your last update 

What can I do now?

The recovery.jsonlz4 file should have your current session. Sometimes it may contain an embedded, unrecovered list of your previous session. You could check it on the Scrounger page.

Otherwise, check the previous.jsonlz4 file on the Scrounger page, and the upgrade.jsonlz4 file if it's the one from this week.

After using Scrounge URLs, if the list looks useful, use Save List to create an HTML page of clickable links for recovery. You might also be able to persuade Firefox to restore the older file, but that doesn't always work.