If you are running a recent distribution release, say, Ubuntu 11.04 or Linux Mint 11, you are likely running Firefox 4. But what if you want to run the bleeding edge version (of Firefox), that is the Daily Build?

Not long ago Mozilla changed the release cycle of Firefox, so that major new versions (Firefox 5, 6 and so on) will be released every 2-3 months. Currently, the latest alpha release is Firefox 6 Aurora, while the latest beta development version is Firefox Beta 5, which has made it into the Firefox Next PPA already. Installing this version should be very easy if you follow the next steps.

... this Firefox version, carries the code name "Namoroka" Alpha 1, and it is also currently referred to as Firefox.next. And like other Firefox Alphas, it does not bare the Firefox logo. This release uses the Gecko 1.9.2 engine and will likely include several interface improvements in later versions, such as new graphical tab-switching behavior, which was removed from 3.5 with Beta 2.

In this short guide I will show you how you can install the new Mozilla Firefox 4.0 browser (released March 22, 2011) on an Ubuntu 10.10 desktop. Fortunately, there's a Launchpad PPA repository that has Firefox 4.0 .deb packages, so we can easily install it through Ubuntu's package manager.

In my previous post on installing Firefox 3.5 on Ubuntu 9.04, I explained how to install Ubuntu's firefox-3.5 package. As myself and several commenters realized, this may not be the best solution. The package is branded Shiretoko instead of Firefox 3.5, including the user agent string which can cause compatibly problems with some websites.

If you want to keep a specific package at a specific version on your machine you can try this tutorial.This is very useful if you want to lock specific version of kernel,drivers,application versions

There exists no official flash package available for the 64bit architecture with Ubuntu and Kubuntu. If you click the add plugin button when visiting a page with flash, you are taken to the official Flash site and will soon notice that there are no available 64bit downloads here either. There are some workarounds on ubuntu forums, however, they don't always seem to work and get complicated if you have compiled your own 32bit Firefox. We have been using both the official 64bit Firefox package from the Kubuntu repositories as well as a modified 32bit version I built quite a while ago to get around some stability issues with the 64bit version. So after about a year without flash support, we finally took the plunge and have built a quick and easy solution.

"At last, you can download and use an alpha WengoPhone Firefox extension for GNU/Linux. It has been flagged alpha because, as you may know, GNU/Linux systems are very different from each others, so it's difficult to provide a WengoPhone Firefox extension that works blissfully on most of them. We'd like, by publishing this alpha version, to test WengoPhone Firefox extension for GNU/Linux on the largest number of different GNU/Linux distributions. For this, we'd be pleased that you follow the small set of instructions below, it will greatly help us to publish a stable and robust version soon! ..."

I got up this morning and saw this, which led me to a pretty serious WTF moment, all before having my morning coffee.

From the article:

"Mozilla’s Director of Firefox, Mike Beltzner confirmed the fact that an x64 flavor of Firefox won’t be added to the existing x86 version, per the 32-bit/64-bit Internet Explorer 8 model.