While Google's Chrome has yet to roll-out the inevitable onslaught of extensions, Firefox has loads ready for the taking - many of which provide great value to both developers and designers. Let's look at a few and why you’d want to use them.
Toolbar: This very popular extension provides users with the ability to perform
site checks and disable certain technologies (like
browser which is helpful during testing. The extension has won the hearts and
minds of designers and developers though mostly because of the ability to edit
CSS in order to see if an alteration would fix a problem.
YSlow: With over 8,500
downloads each week, YSlow is an immensely popular tool to help developers (and
designers) analyze web page load times, letting them know why they are slow
based on Yahoo's rules for high performance websites. Those using the extension
can see a performance overview, HTTP/HTML summary, a list of components on the
page and includes tools such as JSLint.
An excellent extension for developers, Server Switcher is a navigational help
tool. That means users can switch between sites on their development (platform
hosting the temporary version you are currently working on) and live servers, so
that changes can be immediately seen. I use this tool regularly at home.
Features include support for subdirectories (as well as different ports and
local files), multiple projects can be created, and the whole app can be
launched with a keyboard shortcut.
Injection: With all the fear surrounding SQL attacks the past few
months, this extension might help to allay some fears. The component transforms checkboxes, radio
buttons, and select elements in form fields to an input text, providing
the ability to disable elements from the forms. This makes it much easier to
test and identify SQL injection vulnerabilities.
Error Search: bug.gd is the global error search engine. Everyone helps
grow the database by providing their solutions to unsolved errors they run into.
The goal is to ensure that no human ever has to research an error that has
already been solved. Simply copy an error message and click a couple of buttons
to start searching for a solution - you can't get much easier than that.
Drastically reduced the number of network calls required, using the new
XML-based bug.gd API.
1.2.1: Firebug integrates with Firefox to put a wealth of development
tools at your fingertips while you browse. You can edit, debug, and monitor CSS,
developer tool for interacting with web services and other web resources, Poster
lets users make HTTP requests, set the entity body, and content type so you can
interact with web services and inspect the results. Features include the ability
to set request parameters, and save preferences for an individual session or permanently.