I have downloaded an RSS extension for Firefox (Wizz RSS News Reader) from its website. I did it yesterday, and as soon as I opened Firefox the extension was right there in my browser, however, I didn't add any rss or made any changes. The problem showed up this morning when I decided to actually add a couple of sources from news and blogs. I opened Firefox but the extension wasn't there anymore! it just disappeared! so I went and checked in the tools -> add ons menu of the browser and to my surprise the extension was in the list of my add-ons, I thought that perhaps there was an error when