Month after month, year after year, on each Patch Tuesday Microsoft had to release fixes for Internet Explorer. Without these patches, the browser was vulnerable to various attacks that could allow malefactors to steal personal information and execute their own nasty code inside IE. Microsoft's developers have a novel solution for that problem—give IE the axe!
http://www.pcmag.com/article2/0,2817,2488255,00.asp
No More Toolbars
For years, Internet Explorer has offered Protected Mode, which isolates the browser's memory space from other processes, making attacks very difficult. However, common add-ins like toolbars and Browser Helper Objects (BHOs) didn't work in Protected Mode, so it was disabled by default.