Rated 4 out of 5 stars
I generally need to do RSS validation while my code is still in development (which means it's not on a publicly accessible server). Would be great if the validator would run locally on my box. Otherwise, it's not much use to me.
Review of RSS Validator 3.0.0 Rated 5 out of 5 stars
When this add-on is installed, just right click for RSS Validation using w3c's RSS Validation service.
Sure this feature is a part of other web development add-ons, but RSS Validator is only for RSS validation without the bloat that other add-ons have.