This is good to hear. 
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But when the firebase got value block, I don’t think you need to use such if condition. Because in the previous step you defined , what tag must be call? Alternatively that if condition will always turned true only. Evan if you remove that if condition remaining blocks would work normally
BTW, for your above query(in this topic) pls refer this post, get idea then design your blocks as per my suggestion in the previous post.