Firefox is a web browser and has an intuitive interface. It blocks viruses, spyware, and popup ads. It is easy to install and its packed with useful features like tabbed browsing, live bookmarks and an integrated search bar.

Firefox can be installed on the following operating systems:
  • Windows
  • Mac OS X
  • Linux
  • OS 2
  • Solaris
There are a few basic commands you should know:

Ctrl+GFind Again.
Ctrl+NOpens a new browser window.
Ctr+OOpen a file.
Ctrl+RRefresh window.
Ctrl+TOpens a new Tab window in the browser.
Ctrl+TabAlternate between tabs.
Ctrl+UShow page source.
Ctrl+WClose a Tab window in the browser.
Ctrl+Shift+W Close window.

Firefox extensions

Extensions are small add-ons that add new functionality to Firefox and are easily installed. It can be everything from relatively simple utilities to advanced tools such as a JavaScript Debugger and Document Inspector.

In this quick guide several extensions are mentioned which are very useful from a web developers point of view.

Operating system used
Windows XP Home Edition Version 5.1 SP 2

Software prerequisites

Firefox extensions can be found at:

HTML Validator

HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing. The extension is based on Tidy.

HTML validator

More information see:

lori (Life-of-request info)

For a given page:
  • Track how long it takes to see the first byte from remote server (time-to-first-byte (TTFB)).
  • Track how long it takes to complete displaying the page (time-to-completion (TTC)).
  • Track the page size.
  • Track number of sub-requests used to build the page.
When installed, you will see in the browser lower right corner the following information when a page is requested.


More information see:

Regular Expressions Tester

Testing Tool for regular expressions with color highlighting.
When installed, this extension can be found in the menu bar: Tools | Regular Expressions Tester.

Regular Expressions Tester

More information see:

More information about javascript regular expressions.

Tamper Data

Tamper Data is an extension to track and modify http/https requests. It is used for:
  • security testing of Web based applications
  • tracking request/responses
When installed, this extension can be found in the menu bar: Tools | Tamper Data
or View | Sidebar | Tamper Data.

Tamper Data

More information see:

Web Developer

Adds a toolbar with various web developer tools.

Web developer

More information see: