Hi Spam is more of an email thing that something that you can control directly in the Firefox web browser. General good advice to deal with spam is to make use of your email service providers junk mail filtering tools, be careful where you use your email address and to not reply to spam. I notice that you are using an older version of Firefox. I strongly recommend that you update so that you have the latest security and stability fixes as well as new features. You can read more about how to update [https://support.mozilla.org/en-US/kb/update-firefox-latest-version here]. I hope this helps, but if not, please come back here and we can try to look into a different solution for you.