Rated 4 out of 5 stars
Is the "use default icons whenever possible" option not available for Linux? I see it on the (Windows) screenshots, but not in my own options menu (Ubuntu 8.04).
This is a shame, as I actually quite like Firefox's Tango-inspired default Linux icon set, and would dearly love to have the option of telling Menu Icons Plus only to apply Tango where the Firefox default has no icon available. If that could happen in a future release, it would make this Linux user very happy.
This is a really nicely put-together add-on. I especially liked the well-written instructions on your site explaining how to go about creating a new icon set, complete with GIMP template for download and everything. Very helpful.
The "use default icons whenever possible" option is currently only available on Windows. Linux support for this feature may be added in a future version.