I think it meant the program you are using for e-mails. Not an add-on.

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

FredMcD: This is the answer about texting I was referring to: https://support.mozilla.org/en-US/kb/send-messages

"The Firefox OS Messages app lets you send short text messages (SMS) back and forth with people. You can also send and receive images, videos and other multimedia attachments (MMS). This article will get you up and running in no time. "

I am using yahoo as my mail program and I still don't see anything about phone texting there. Do I need to go to Yahoo Help instead of Firefox help?

Ahh. That is talking about Firefox on a cell phone.

OK I will try to be clearer, or smarter. Either way, I am still not completely seeming to get a clear answer to what must be my unclear question. I want to know if I can text (as in a cell phone text message) from my computer to a cell phone number (smart phone/Iphone) if the computer is running FireFox. You are saying the article is talking about cell phone to cell phone if both have firefox downloaded? And nothing about a firefox computer involved?

https://support.mozilla.org/en-US/kb/send-messages is a support article for Firefox OS (operating system) for 'low-end' smart phones that were only available in developing countries, like in Africa and Asia. Plus, Firefox OS is defunct now, no new devices are being sold that use it; updates have been curtailed for other than security fixes.

http://www.digitaltrends.com/computing/how-to-send-free-text-messages-online/ http://www.howtogeek.com/221476/how-to-send-sms-messages-from-any-pc-or-mac/