Firefox Plugins & Other Browser Plugins

15+ Firefox Plugins you wont want to live without. A list of my favorite Firefox Plugins for all to enjoy. I will also try and make some honorable mentions of plugins I think are cool even though I myself do not use them. Hooray for Firefox! Boooo for IE.

• Firebug
  Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...
• Web Developer
  Adds a menu and a toolbar with various awesome web developer tools.
• ColorZilla
  Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies...
• Font Finder
  Highlight text, right click, select font finder and bam! Find your font.
• HTML Validator
  Self explanatory.
• FireShot Screen Capture Tool
  FireShot is a Firefox extension that creates screenshots of web pages. Unlike other extensions, this plugin provides a set of editing and annotation tools, which let users quickly modify web captures and insert text annotations and graphical annotations. Great for web designers!
• Screen Grab!
  A great way to quickly grab screen shots from your browser or any shape or size.
• YSlow
  Gives you a performance evaluation based on Yahoo's rules of high performance.
• Measure It Ruler
  Nice ruler to check height and width. Web developer also has this under miscelaneous.
• Download Them All
  DownThemAll is all you can desire from a download manager: it features an advanced accelerator that increases speed up to 400% and it allows you to pause and resume downloads at any time.
• Pixel Perfect Plugin
  Pixel Perfect is a firefox extension that allows web developers to easily overlay a web composition over top of the developed html.
  
  By toggling the composition on and off, the developer can visually see how many pixels they are off in development. Pixel Perfect also has an opacity option, so that you can view the HTML below the composition. Being able to see both the composition and the HTML, you can now simultaneously use Firebug while Pixel Perfect is still in action.
• ViewSource With
  The main goal consists to view page source with external applications and a hell of a lot more.
• Remove Cookies
  A very simple extension to remove all the cookies of currently opened site. It adds an option to the Right Click menu of the page, and a toolbar button to perform this operation. It displays the status of operation in the status...
• Pencil
  For everyone who wants a tool to make diagrams and GUI prototyping. (Open Source)
• Aaron Wall SEO Tools
  Aaron Wall is my SEO hero. This is a plugin you should defintely check out for getting Google or Yahoo rankings as well as many other useful features.
• Windows Resizer Tool
  Resize your browser to various standard resolution sizes. Great for webdesigners!
• Image Zoom
  Easily zoom in, zoom out, fit image to screen or set custom zoom on individual images within a web page. All this can be done by using the context menu or a combination of mouse buttons and scroll wheel. Handy to see the finer details of smaller pics or to make very large pics fit within your screen.
• Colorful Tabs
  Tired of bland looking grey tabs? Nothing like adding a little color to better visually separate what you are working on.
• FireFTP
  FireFTP is a free, secure, cross-platform FTP client for Mozilla Firefox which provides easy and intuitive access to FTP servers.

IE Compatible:

• XRAY
  XRAY is a bookmarklet for Internet Explorer 6+, and Webkit and Mozilla based browsers (including Safari, Firefox, Camino or Mozilla). Use it to see the box model for any element on any web page. (Thanks Josh)