how do I uninstall an add-on that is not showing up on my list?

When I go to my Facebook page, part of it has a message that reads "ads by browse to save" maybe a hundred times on the page. If I click on a picture or something, "ads by browse to save" will keep popping up, as long as the window is open, making it nearly impossible to comment/read other comments. I clicked the link and it brought me to which gives instructions on how to uninstall it from firefox.

The PROBLEM is that "Browse to save" doesn't show up on my list of extensions/add-ons/plug-ins. This happened to me before with a different "ad" website and I had to uninstall/reinstall firefox. I was hoping to not have to do that again, especially since I don't know what's causing it. I do have screenshots (although I don't see where to add them).

Any help would be appreciated!

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