Firefox is a great browser and is also a great development tool in itself. There are some problems though with the numerous extension available to developers. They are a great resource when programming but they slow down (and in some scenarios they might even break) our normal web browsing.
So the idea is to have a normal Firefox installation to use as our browser and then a separate install (and profile) used only for development purposes. This way we can install tons of development related addons without worrying about slowing down our normal browsing.Read more