Helpful, needs confirmation Rated 4 out of 5 stars
I find the button really useful, but it'd be really helpful if it had a confirmation box to prevent accidental restarts. Luckily I use a text-area cache saving extension so I haven't lost anything yet. :)
I'm also glad that the author chose to use full-color icons (I use the :-/ one) instead of Mozilla's blah monochrome. It'd be nice if there were options that were more suggestive of a restart, though -- maybe the author could accept submissions and include the best of those, or let us use images from our drive?