OP did mention they are using a Android Tablet, so Chrome is there by default.
I understand why OP is trying to not use Chrome, it is a personal data slurping browser, but, Android isn't squeaky clean either and slurps personal data also.. Privacy of either is not on the top of Googles list.
Although it is a bit humerus to think that one will reduce the personal data consumption while using Googles Gmail :S
You ARE "the product" your data is what makes it worth while for companies like Google to spend money on a OS and Browser and give it out for free.