You can also go to firefox.com from your tablet, it will detect your on android, and you can download it from there. Once its finished downloading itll pop up asking you to install. Easy stuff.
I prefer firefox.com/beta then go with Aurora, the alpha. Much nicer UI.
Also the beta and alpha update themselves.
?Yamagushi,
Thanks for your direct and succinct post. Out of the bunch of replies to this post, you've given the readers the "straight dope" on the availability and viability of Firefox Browser - though I wonder how many readers will actually grasp this.
I've been using Firefox (Version 27.0) for a couple of years now, on both my Nexus 5 and Nexus 7 tablet (the 2012). I stopped using it as my primary when KitKat (4.2.2) rolled out on my Nx5 & Nx7; Chrome finally got its act together and on the Nx5 it's just smooth as silk - I love it.
In any event, for those looking to get Firefox (version 27.0 is still current) head over to the Play Store (app) - it's available for download, free. I'd stay away from "Beta" because it's VERY buggy (you can read the reviews for yourself). If you're looking for a companion browser, i.e. use Firefox as your secondary browser for flash then for my primary browser I'd use Chrome. Read on...
Personally, I prefer Chrome and I never thought I'd ever say that. Aside from it developing into a truly, bona fide 5

browser, it gives you so much flexibility and integration with all of Google's apps, which are ubiquitous these days.
Additionally, Chrome's cross-platform synchronization can't be beat. It syncs all of your browser history, open tabs (which are now unlimited and very easy to manage) and bookmarks from your cell to your tablet and vice versa. It's fast, seamless and simply wonderful.
I've not found any browser that can do what Chrome does - free or paid. The biggest drawback is it's "bloat" but, if you running Google Play Store edition devices, they can handle the job.
My Google Nexus 7 & Google Nexus 5 (both 32GB RAM) churn through Chrome all day and the cross-platform compatibility is like a custom made suit. At the end of the day, Google = Android and Android = Google and all of that adds up to a user friendly, less "housekeeping", more time to spend having fun Android experience.
So, if you have 25.62MB of room to spare on your device, I'd definitely download Firefox browser. Once you have it setup for flash, as outlined in the post, it does work most of the time. Firefox makes a great addition to any other browser. Hopefully, it will be the addition to your Chrome browser.