Slow-down in some websites. Rated 3 out of 5 stars

The new version still have problems in some websites and slow-down de browser.

Try http://lifehacker.com/ for example.

This review is for a previous version of the add-on (2.4.3). 

Fixed in 2.5.0

Version 2.5.0 should perform a lot better:

https://addons.mozilla.org/en-US/firefox/addon/wappalyzer/versions/?page=1#version-2.5.0