With this add-on for Firefox you can integrate Google’s task system into the browser. You don’t need to login again or any extra work. Once you install it, the button opens a panel that you can close by clicking anywhere else and hovers over your existing window.
You can also configure the size of the panel too. From within, you can add, remove and edit your tasks as you see fit too. The button for the extension can be moved too (if you do not like the default location). This should really help you with being more productive.
You can pick up the GTask Panel add-on from the Firefox Add-ons website.