Useful Firefox addons for web developers

Permanent Link: Useful Firefox addons for web developers 9. Februar 2009 Comment No Comment

Here's a short list of useful Firefox addons for web developers:


Probably the most useful addon around. You cannot only change the whole page on the fly (HTML and CSS) but you also have the very useful Javascript console which can even be used by your application for debugging. Furthermore you can see all AJAX activities. Download at


FirePHP allows you to send debug messages to Firebug through a PHP Script. Download at


Greasemonkey allows you to create JavaScript scripts for specific or all websites (Use of wildcard * possible!). This can be very useful to either test how new scripts would integrate into your website or to change the look and behaviour of any other webseite. Download at


Same as Greasemonkey only for CSS. This way you can easily test new styles on a website before integrating them. Download at

Web Developer

The classic one. Allows you to easily change behaviour of your browser (caching, JavaScript, etc.) and has a whole lot of other useful tools like showing document size, the styles, submitting the page to the W3C Validator, Browserframe resize (to test your application for specific resolutions), viewing response headers, outlining specific elements and so on. Download at

Search Status

Although it also shows the page rank (not very reliable), I only use this addon to display all the nofollow links on a page, which is really extremely useful. Download at

DNS Cache

My own Firefox extension that allows you to disable the DNS caching of Firefox, which comes in quite handy when you have to check your webservers quickly. For a more detailed description see here. Download at