Write SQL query to solve given problem: How much is the size of Browser 4G and how many users have a pretty positive favorability on it?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.Size, COUNT(T1.App) FROM playstore AS T1 INNER JOIN user_reviews AS T2 ON T1.App = T2.App WHERE T1.App = 'Browser 4G' AND T2.Sentiment_Polarity >= 0.5