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Great no login/no signup communication tool Rated 5 out of 5 stars
Awesome addon! Really changes the way we can comment to each other all over the web without ever signing in or signing up to each website! That is beauty of this! Makes it quick and easy to get in touch with other users on the websites you like! The only drawback I see is needing a browser that supports the add-on. Either Firefox or Chrome. That is nothing though sense most people use at least Firefox!
Hopefully a Opera add-on is soon made as well so even more people can join in on the fun of Open Comment!