You may, or may not enjoy the default loading bar color for Firefox 3. If you may want to change it, you may do so using the following option:
1. Locate the userChrome.css file in your profile folder (more information may be found here).
2. Add the following code to the userChrome.css file:
/* Change the progress bar color */
.progress-bar {
-moz-appearance: none !important;
background-color: #660000 !important; }
3. You may change the color in bold to your prefered color. You may see the colors here.
Plurk has become on of the best social networking sites out there. It is used by many people to “Plurk” and get more Karma! Here FirefoxGeeks will show you how to do such:
1. Drag and drop the following link into your “Smart Bookmarks” bar:
http://www.plurk.com/m
2. Right-Click on it and select “Properties.”
3. Click “Open in Sidebar.”
4. Now, all you need to do is click the link and Plurk mobile should load in your sidebar!
Stylish is a really neat extension similar to Greasemonkey. It allows you to install certain scripts created by others to make websites and different pages look the way you want them to look. One “userstyle” called “Google Web Search - Dark Blue Redesign” obviously changes Google to be dark blue and adds some other cool looking functions to the Google homepage. (Note: This only works with Google. You may edit the address in notepad to make it work for google.co.uk or such if you like.)

You may see all of the other “userstyles” here, or even create you own!
(Image from http://www.firefoxfacts.com/2008/07/22/turn-google-a-little-blue-just-for-you/)
It can become completely absurd when windows are continually resized and possibly messing up other tabs. Here we will show you how to prevent windows from automatically resizing.
1. Type about:config in the address bar.
2. Locate dom.disable_window_move_resize
3. Double-click it to set it to true.
You may want to conserve toolbar space or possibly just do not enjoy seeing the stop, back, and forward buttons at different times? Well here we will show you how to do that to make Firefox just that much better.
Locate your userChrome.css file in your Firefox profile, e.g. C:\Documents and Settings\[username]\Application Data\Mozilla\Firefox\Profiles\[profile name]\chrome
Add the following code to the file for each button. (Note: The stop button should appear when a page is loading and should disappear when the page is not loading. The Back button should only appear when there is something to go back to. etc.)
Stop Button
#stop-button[disabled="true"] { display: none;}
Back Button
#back-button[disabled="true"] { display: none; }
Forward Button
#forward-button[disabled="true"] { display: none; }
Previously, Firefox did not support the option to allow users of web-based email to have mailto: links sent to their web-based email providers. Now, you may tweak Firefox to allow mailto: links to be redirected to your web-based email. Here is how to do it with Gmail:
1. Type about:config in the address bar.
2. Find gecko.handlerServiceAllowRegisterFromDifferentHost and set it to True by double-clicking it.
3. Copy and Paste the following code into your address bar:
avascript:window.navigator.registerProtocolHandler(”mailto”, “https://mail.google.com/mail/?extsrc=mailto&url=%s”,”GMail”)
4. You should be asked to verify you want to use Gmail as your default for mailto: links.
Firefox is most certainly the fastest browser available, yet it can get even faster.
1. Type about:config in the address bar.
2. Find the following entires:
network.http.pipelining
network.http.proxy.pipelining
network.http.pipelining.maxrequests
3. Set network.http.pipelining to True.
4. Set network.http.proxy.pipelining to True.
5. Set network.http.pipelining.maxrequests to 30 or somewhere around 30.
6. Right-Click and select “New,” “Interger” and name it nglayout.initial.delay. Set it to 0.
Now, you should be able to load websites much faster!