Rated 5 out of 5 stars

A simple improvement that does exactly what it's supposed to do. Thank you.

Some reviewers have asked for more features, such as changing the appearance of the throbber. Please do not. Feature bloat is the bane of FF extensions. The best extensions are usually tiny, simple adjustments that make a surprisingly disproportionate improvement to the user experience. Too often those extensions grow and grow because of user requests, until they little resemble the great little wonders that they once were.

Thanks again to the developer. :-)