This addon removes that pesky add-on install delay. Yeah, it's a security fix, but how often do you press Alt-A and then Enter or space? You're smart enough to know that any place that tells you to click on a spot on the screen and type in a word is trying to trick you. You know all the tricks.
So why should you have to wait to install? Well, you don't. Firefox has a built in way of removing the delay. But some of you prefer to have an addon to do all the work for you rather than mess around in about:config. This addon is for you.
Now, just in case you don't know all about the risks, please read about it from the guy who discovered the problem
.Known IssuesEventually Firefox is supposed to completely overhaul the addon install system, which should make this addon redundant. However, this has not made it in as of Firefox 26.Pressing and holding down alt and typing a word that has an a in it, plus hitting enter, can wind up installing an addon from an unwanted site. There's no legitimate reason for a site to ask you to do this, so leave said site immediately.