Accelerators are a new feature in IE8 that allows quick access to various functions via the browser context menu. They were called "Activities" when this extension was written For now I am keeping the "Activities" name to avoid having to retranslate the extension. You can get more information about Accelerators here: http://www.microsoft.com/windows/internet-explorer/features/accelerators.aspx
![IE8 Activities (Accelerators) for Firefox :: Add-ons for Firefox](https://cdn-ak-scissors.b.st-hatena.com/image/square/3ba68f05bb6d13a201ef49f2a14c19c23557aa58/height=288;version=1;width=512/https%3A%2F%2Faddons.cdn.mozilla.net%2Fuser-media%2Fpreviews%2Ffull%2F19%2F19272.png%3Fmodified%3D1530208390)