Here are a few things you can try: 1)Check if the tabs are still open in another window: Sometimes, when Firefox crashes, it will open a new window with all of your tabs still open. To check if this is the case, click on the "Tabs" button in the top-right corner of the window and look for any open windows that have your tabs. 2)Check your "Recently Closed Tabs" list: If the tabs are not open in another window, you may be able to restore them from the "Recently Closed Tabs" list. To access this list, click on the "Tabs" button in the top-right corner of the window and select "Recently Closed Tabs". You should see a list of the tabs that were open when Firefox crashed. You can click on any of the tabs to restore them. If none of these steps help, you may want to try starting Firefox in Safe Mode by holding down the "Shift" key while starting the browser. If the issue does not occur in Safe Mode, it may be an issue with an extension or plugin. You can try disabling or removing the extensions or plugins one by one to see if that resolves the issue. If the issue persists after trying these steps, it may be a problem with your Firefox profile. You may want to try creating a new Firefox profile to see if that resolves the issue. I hope these suggestions are helpful! Let me know if you have any other questions.