Mozilla does not install add-ons unless you choose to do so.

You may have ad / mal-ware. Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

It’s very sad, but many of the software downloaders/installers will trick you into installing not only their program, but other programs as well. You have heard of the fine print in shady contracts, right? Well, some installers you need to look at the itsy bitsy teeny weeny fine print. You are thinking you are giving the installer permission to install the program you want by using the recommended option. But if you use the Manual Option Instead, you discover all kinds of stuff that you do not even know what it is or what it does. From now on, everyone needs to Use The Manual Option to put a stop to this.

Note that these programs can also change browser/computer settings

kschwabe said

this popped up on mt browser yesterday with the firefox globe. does it come from firefox? what is it? it went into add-ons. it looked strange. when i clicked on it it disappeared. i ran windows defender . no virus was found. thank you.

No this is not from Mozilla or the Firefox web browser.

Its possible that you downloaded software from a WebStore that uses the Secure Download Manager. It can come under different urls as another example is http://firefox-17102.avstats.com/

Mozilla does not use this SDM for any of their products including the desktop Firefox web browser from www.mozilla.org/firefox/all/

Depending on the SDM software it can install a number of things on Windows.

examples http://www.shouldiremoveit.com/Secure-Download-Manager-13263-program.aspx http://www.shouldiremoveit.com/Secure-Download-Manager-9432-program.aspx