In the last-post, I went through the most popular Firefox extensions and talked about whether they were good ideas or not. However, it seems that not a lot of people think about another side to this, i.e. what are your Firefox extensions licenced under?

One of the major reasons Firefox is approaching 400 million downloads is because of how customizable the browser is thanks to extensions. In a way Firefox extensions are bittersweet, because they can provide some unique and useful features, but at the same time they can cause some unwanted problems.

Installing these Firefox extensions, like installing any other Firefox extension, is just a matter of clicking the shiny green Install Now button from the extensions' homepages. You'll find both the extensions enabled after a browser restart to complete the installation.

Now, a lot of people publish lists of 'best' extensions. It's quick and easy to make these lists. One difference between my list and some of those "99 Must Have, Best Firefox Extensions!" is that is the real list of the extensions that I use every day. These don't just sound good, they work well.

Mozilla's Firefox browser is among the most popular of all open source applications, and one of the reasons is that it is so extensible and customizable. You probably have lots of favorite Firefox extensions and have picked up some tips, but continuing to add to your arsenal makes lots of sense.

"Create extensions that go beyond the built-in capabilities of Web browsers. The Mozilla project's XUL engine is a user-interface language that you can use to extend Mozilla browsers, or to build stand-alone applications. XUL is a surprisingly easy way to build cross-platform browser extensions, and this pair of articles demonstrates how."

"XUL is a surprisingly easy way to build cross-platform browser extensions or even stand-alone applications. Discover how to build powerful, flexible Mozilla browser extensions that go beyond the capabilities of other tools..."

We’ve put together a list of 30+ must-have Firefox 3 extensions that we know you’ll enjoy, whether you’ve upgraded to Firefox 3 and are looking for something new to add to your browser, or have yet to make the upgrade and are looking for a reason.

"...For an overview of extensions that will work with one of the Firefox 3 betas, check out this, somewhat obtuse, but largely functional chart, which tracks Firefox 3 compatible extensions..."