actualy, not so good Rated 4 out of 5 stars

browser first show all content and only after that it is blocked by addon.
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Ok. Seems the problem is partially fixed, but still flash objects are rendered before filtering. (Addon flashblock is installed)

This review is for a previous version of the add-on (1.7.9.2). 

Not anymore!

From version 1.7.9.2, ProCon has a functionality where the web page will be rendered after the filtering, without affecting the browsing speed at all! Hope you'll enjoy it.