Hello! You'll need to install the Free Download Manager software first in order to use the FDM browser addon. The latest version is available for free on our official website. If you face any problems you try this, get in touch with our support team using the following form: https://www.freedownloadmanager.org/support.htm

Hello! Sorry to hear about your issue. It appears that there's a conflict between Firefox and FDM. Please try to update both applications to the latest version. If the problem persists, consider reinstalling both programs. Also, check the Firefox crash report for specific issues. Should the issue continue, kindly reach out to our support team through this form: https://www.freedownloadmanager.org/support.htm.