Cool firefox plugins
The cool firfox plugins that you can use are:
a) Firebug : Allows you to inspect HTML, extract XPATH and debug Javascript.
b) Yslow : It allows you to compare a web server/websites perfomance.
It will give website "grades" and "marks" - based on the tuning on
the website(eg you web server may not be gzipping data or you may have too many "js" files)
c) Selenium : This is a cool plugin to firefox - to do record and play (like winrunner, QTP) and export test to Java(like httpunit), .net and
also play the test in all browsers.
You can more overview/information here.
d) Tamper data :
This plugin allows you to inspect hidden fields, browser "header fields" and tamper/manipulate
it for your security/QA testing.
Please let me know if I missed any good plugin (for "web" developer).