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Icon overload.
It might just be me, but I don't like to see loads of icons all over the menu bars of my browser. Although there's no doubt that Acoo has some nice features, I think that the volume of icons in the program is too much and it's not immediately clear what each of them does. Once you get used to them it gets better but it offers nothing extra for me than you can do with Firefox extensions
Pros: Lots of options
Cons: Confusing to use