Want to clear any stored information about one web site in particular, without clearing out all of your browser’s history files?  Hidden deep within the Firefox browser, there is a way to clear Firefox’s history for just one single web site.  You just have to know where to look.

Did you know that Firefox comes in handy when it comes to proof reading pages?  Using a simple bookmarklet, you can easily enable Firefox’s built in spell checker on any web site.
The first step to take would be to bookmark this link (or drag and drop it onto your bookmarks toolbar).
+ spell check
When the bookmarklet is clicked, Firefox will turn on the built in spellchecker and highlight any misspelled words that are on the page you are currently browsing.  [...]

I start every one of my Firefox browsing adventures with iGoogle loaded up as my home page.  However, I would like to check up on my iGoogle page without going to the homepage over and over again through the day.  Can I just load it up into the sidebar?  Yes, we can!
 
How do you make it happen?  Drag this link to your bookmarks bar:

iPhone iGoogle Homepage

Now, right-click the bookmark, and select Properties.  Click the check mark box for loading [...]

You can load up Google News in your Firefox sidebar.  This quick tip and tweak will give you the ability to check out the iPhone optimized Google News in your Firefox sidebar.  This makes scrolling through the day’s news an even quicker and easier experience.
 
How do you make it happen?  Drag this link to your bookmarks bar:

iPhone Google News

Now, right-click the bookmark, and select Properties.  Click the check mark box for loading this bookmark in the sidebar, and [...]

Need to access the Firefox 3 Library function without clicking on Bookmarks, then Organize Bookmarks?  You could always go with the keyboard combination Ctrl+Shift+B.  Want an easier one? Try typing this in your address bar:
chrome://browser/content/places/places.xul

This will open up your Firefox 3 Library inside of your main browsing window.  Now you can have a little more screen real estate to edit and manage your favorite links.  Bookmark it and get this "big view" at your fingertips anytime you need it with [...]

Watching the Mozilla Labs discussion on Personas is really exciting. It looks like they have more than a handful of great designers and there are so many different ways this Mozilla project could go in development.
If your interested in getting involved, here are a few links to get you started:

Design details for your Firefox Personas
Designers: Testing Your Design
Localization of your Personas for Firefox Install

You can also browse through some of the designs people have submitted too. In a [...]

In need of a quicker way to launch Firefox with a series of tabs? You can quickly do so in Windows by clicking on the start button, then go to run (or just hit Win+R) and type in:

Been playing with this for a while, and have yet to break it. Seems to work flawlessly each and every time. If you jut type in “firefox keyword” then you will get the same effect as just typing a phrase [...]

You browse those articles, web sites and Web 2.0 masterpieces, give them a quick look over and say to yourself, “I should really comeback here later” because you know your suppose to Christmas shopping – not browsing through interesting pages.
Quick Place to Store Pages for Later! 
If you have been in these situational shoes before, I have a quick fix that will let you get back to work. No extensions are needed and only a little browsing habit needs to [...]

Want to get a little more from Firefox when it comes to backing up your bookmarks? Not many people know that Firefox actually does save backups (one a day) of your bookmarks. They should be located in your “profile” folder. On Windows XP that would be here:
C:\Documents and Settings\YOURNAME\Application Data\Mozilla\Firefox\Profiles\UNIQUEID\bookmarkbackups
You can change it though to go a little higher. I wouldn’t recommend bumping it up too much more, but a jump from 5 to 10 shouldn’t hurt [...]