I cann't understand you actual problem. Would you please give us a screenshot...?

. Whenever you get a message / popup like that;

DO NOT USE ANY OF THE PROVIDED LINKS OR ANY PHONE NUMBERS ! !

Such messages are only Spam that could lead you to Fake Support. Not only can they damage or hack your system, they charge you to do so.

You can report such a site at; Google Report Phishing Page {web link} which is the same when done while on site by going to Help > Report Web Forgery

Help us safeguard Mozilla’s trademarks by reporting misuse {web link}

Separate Security Issue: Update your Adobe Reader Version 2015.016.20039 Note: Other Software is offered in the download.

I also keep getting this message; it opens a new tab, entire page is orange with firefox logo, and says it needs to be updated. I get this a lot, how can I stop this? If it's not legit, why can't Mozilla stop it from happening?

People are working on solving this.

Unfortunately, the malware distribution page keeps moving to new sites on a daily basis. Firefox's built-in phishing and malware protection feature uses a list of bad sites compiled by Google. (You can contribute new sites to the listing here: https://www.google.com/safebrowsing/report_badware/.) Because the sites keep changing, and the unique URLs of the malware make it difficult to confirm from test systems, the bad sites list cannot keep up.

Since the page appears to be opening from advertisements on sites that users visit, it might help to use an ad blocking extension. These are popular (Note: you would only want to use one at a time):

• https://addons.mozilla.org/firefox/addon/adblock-plus/
• https://addons.mozilla.org/firefox/addon/ublock-origin/