Greasemonkey

The customization of an Internet browser often involves the use of third-party extensions designed to add new functionality or extend existing features. One of the browser that pioneered this type of add-ons is Mozilla Firefox which has a huge number of extensions written especially for it.
When it comes to optimizing the way in which webpages load and behave, there is a particular add-on that is built to handle such tasks. It is called Greasemonkey and serves as a manager for user-defined scripts.
With the help of this extension, anyone can enhance their preferred websites and enjoy a completely new level of practicality. Individualized scripts make it possible to tinker with each webpage you visit often and Greasemonkey balances everything, allowing users to keep track of installed scripts and customize their settings.
In case you want to add a personal touch to a specific page, you have to possibility to write a script of your own, if there is none to be found online to accommodate your needs and requirements. You just have to pick the desired script editor from the 'Options' area of Greasemonkey.
Should you have one or more websites that you want to keep as they are, there is a 'Global Excludes' section where you can add an entire domain or just some individual pages. The entries on the list can be easily edited afterwards, if necessary.
A neat feature of Greasemonkey is the ability to check for script updates automatically. More so, it can install new versions of any script that has been upgraded. You also can activate the secure update function and set the number of days between update checks.
To sum things up, it's safe to say that for anyone looking for a means of extending the capabilities of their Firefox browser, Greasemonkey is an alternative that is well worth a try.