A New window automatically opens containing random sites when I use Mozilla Firefox. How can I fix this?

If you are experiencing the problem of random windows or tabs opening when you use Mozilla Firefox, this is likely due to malware or adware infecting your browser. Malware or adware programs can be installed on your computer without your knowledge, and they can cause various issues, such as redirecting your browser to unwanted sites or displaying pop-ups.

To fix this problem, you can try the following solutions:

1. Scan your computer for malware or adware: Use an anti-malware program, such as Malwarebytes or AdwCleaner, to scan your computer for malware or adware. These programs can detect and remove any malicious software that may be causing the problem.
2. Remove any suspicious add-ons or extensions: Malware or adware programs may install add-ons or extensions in your browser without your knowledge. To remove them, open Firefox and click on the menu button (three horizontal lines) in the top-right corner of the screen. Click on "Add-ons" and then select "Extensions" from the left-hand menu. Look for any suspicious add-ons or extensions and click on "Remove" next to them.
3. Reset Firefox settings: If the above solutions do not work, you can try resetting your Firefox settings to their default values. To do this, click on the menu button (three horizontal lines) in the top-right corner of the screen and select "Help." Click on "Troubleshooting Information" and then click on the "Refresh Firefox" button. This will reset Firefox to its default settings and remove any add-ons or extensions that may be causing the problem.
4. Clear your browsing data: Clearing your browsing data, such as your cookies and cache, can help remove any unwanted files that may be causing the problem. To do this, click on the menu button (three horizontal lines) in the top-right corner of the screen and select "Library" and then "History." Click on "Clear Recent History" and select the time range for which you want to clear your data. Then click on “Clear Now.”
5. Update Firefox: Keeping your Firefox browser up-to-date can help fix any known issues and improve its performance. To check for updates, click on the menu button (three horizontal lines) in the top-right corner of the screen and select "Help." Click on "About Firefox" and Firefox will check for updates and install them if available.