This is intended to be a "best of breed" carefully selected tool collection for bloggers, SEOs and internet marketers looking for diverse functionality, without significant overlap.
Collector's Note The primary reason to add this is to use Yslow and Google's Page Speed plugins, though currently I can't find Page Speed listed
Collector's Note Need to add lots of cool plugins, found on Userscripts site
Automate Firefox. Record and replay repetitious work. If you love the Firefox web browser, but are tired of repetitive tasks like visiting the same sites every days, filling out forms, and remembering passwords, then iMacros for Firefox is the soluti...
Collector's Note For when you want to automate things like submissions of articles, videos, social bookmarking etc
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
Collector's Note Prowl around the web as Googlebot and interesting things can happen
FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.
The Web Developer extension adds various web developer tools to the browser.
Collector's Note My default tool for working out what is happening or going wrong with CSS
Use the Evernote Web Clipper to save things you see on the web into your Evernote account.
Collector's Note Saving complete pages for future reference
IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...
Screengrab! saves webpages as images.
New features: upload to internet
Collector's Note My favorite of all screen grabbing software - uses the Mozilla engine to render a full page extremely fast, then you can go back at a later date to edit. Also own commercial Snagit, but this gets used more often. The original version was no longer being supported by the author and this one was released at the very end of 2011 I'm the 11th installer so early testing but so far seems to be working fine.
View HTTP headers of a page and while browsing.
Collector's Note For checking redirects, snagging cloaked affiliate IDs etc. Also great to find the location of videos supposedly being cloaked from Amazon S3 for download.
Use PDF Download to do whatever you like with PDF files on the Web. Regain control and eliminate browser problems, view PDFs directly in Firefox as HTML, and use the all-new Web-to-PDF toolbar to save and share Web pages as high-quality PDF files.
Collector's Note I download PDFs a lot, and it is annoying when you click a link and discover it is a PDF, and it tries to load in the browser.
YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
http://yslow.org is the official open source website.
Collector's Note How fast is your website, and how to fix it
StumbleUpon is the easiest way to discover new and interesting photos, videos, web pages and more, recommended by a community of experts. Tell us what you are interested in and we recommend page after page of amazing stuff you’d never expect to see.
Collector's Note Don't forget to follow my stumbles on Stumpleupon http://andybeard.stumbleupon.com
This extenion is GUI Front-end of "about:cache"...
Collector's Note This is an extra - for those times when you just know you saw a great picture, and can't remember, or for finding videos ;)
Collections are groups of related add-ons that anyone can create and share.Explore Collections