Rated 2 out of 5 stars
This is a regularly suggested add-on for my customers, along with a reminder to donate to those add-ons you treasure. However, this Price Comparison feature was quite embarrassing to deal with. My recommendation has now turned into a word of caution.
Sure the developer apologized for any misgivings and pointed out how easily the option can be turned off. But, now are we to trust this developer or Mozilla's watchdogs in the future. How is it that today's business brains consider this type of invasion good business sense? How is it that we are letting them get away with it? I recommend you not support anyone who advertises this way.