Distribution deals, I am guessing. If you bundle your chrome extension with an installer (Ask Jeeves, when you install Java or Adobe) it's a lot easier to get distribution.
I assume the larger the number of reviews, the higher the engagement of users with the plugin (if they don't think it's part of the browser).
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[ 3.0 ms ] story [ 4.5 ms ] threadWhat can install/comment ratio tell us?
I assume the larger the number of reviews, the higher the engagement of users with the plugin (if they don't think it's part of the browser).