Rated 5 out of 5 stars

A flawless add-on which improves another ones as addblock plus making easy to find offending page blocks. It has glitches sometimes (not displaying frames as it's supposed to do) but it is very useful also for site design.
Thanks for sharing this add-on if you read this comments Eduardo. I am really grateful.

This review is for a previous version of the add-on (0.3).