Rated 4 out of 5 stars

I've found this immensely useful for so many misconfigured servers. The only reason I didn't give it 5 stars is because it has yet to add an option for gzipped files that are not served with the
Content-Encoding: gzip header. I have yet to find any free web host for instance that properly serves .svgz files, like at http://www.archive.org/download/Periodic_Spiral_of_Elements/elementspiral.svgz which firefox could view natively if this extension detected or gave an option to set gzip as the content encoding.

This review is for a previous version of the add-on (1.3).