How to set Gmail and Google Apps Mail as the default mailto client in Firefox 4

Do you want to use Gmail or your own Google Apps domain as the default email client in Firefox 4? Do you want to be able to click on email links and have Gmail pop up? Here is how to make Gmail the default email in Firefox 4 and Firefox 3:

Open up Firefox 4.
Type in "about:config" in the address bar.
Say OK to the warnings.
Search for:

gecko.handlerService.allowRegisterFromDifferentHost

Toggle this from "false" to "true" by double-clicking on it. Keep this tab open because you will want to set this back to "false" when you are done!
Paste this into the address bar in a new tab:

javascript:window.navigator.registerProtocolHandler("mailto","https://mail.google.com/a/yourdomain.com/mail/?extsrc=mailto&url=%s","yourdomain.com")

(You should substitute your Google Apps domain name for "yourdomain.com")

Hit enter after you've pasted this into the address bar.
Add this application for mailto links by clicking on the "Add Application" button.
Go to Firefox Options > Applications and find "mailto".
Choose the new application to use for email (yourdomain.com) by clicking on it.

Double click on the "gecko.handlerService.allowRegisterFromDifferentHost" to set it back to false by double-clicking on it.
Restart the browser.

How To Download and Save YouTube Videos

Have you ever wanted to save a YouTube video in order to watch it on an offline player or embed it in a presentation? Well here is an easy way to download and save YouTube videos or other videos from similar sites: The Video DownloadHelper extension for Firefox is a free Firefox plugin that will allow you to easily save videos or images from web pages that you visit, including YouTube videos. Simply go to the link above and install the plugin in your Firefox browser. The extension will add an icon just to the right of the search bar that will become animated whenever there are video or image files that it recognizes.

To use the Video DownloadHelper just click on the down arrow next to the animated icon and click on the title of the video or image you want to download. It will open up a file explorer window and allow you to save the video anywhere you like. YouTube and similar videos will be saved in a Flash .FLV format. These files can be played by opening them up using your browser, the Adobe Flash Player, or with the free VLC Media Player.

This is far and away the easiest way to capture movies for replaying offline, for archiving, or for embedding in presentations.