After all this time of tweaking and hacking the way you work, we know you’ve got a few great shortcuts and timesavers up your sleeve that help you get stuff done faster on your computer. Now we want to see ‘em in action! Submit a short screencast of your favorite computer shortcut in action, and get a chance to win an autographed copy of Lifehacker the book. Fame, adoration and a free copy of the Lifehacker book await, just beyond the jump.

Here’s how this will work. You record a VERY short screencast of your favorite desktop or software shortcut - something that saves you time, that you can’t live without. You’ll upload it to Google Video or YouTube or your internet video provider of choice, and email us the link. If we like your stuff? We’ll feature it here on Lifehacker and send you a signed copy of the Lifehacker book.

More details:

• Your screencast should be between 30 seconds and 2 minutes. Longer ones will only be accepted if the length is absolutely necessary; remember, we’ve got the attention span of fleas.
• If you ‘cast a tip or trick we’ve covered here on Lifehacker before, that’s ok - as long as your video demonstrates it more clearly than we could in plain old text.
• For a couple of examples of what we’re looking for, see this one on mastering the Windows key and this one on mimicing Stacks in OS X. Fun sound effects, quick cutting, and general goofiness-with-a-purpose welcome. Get creative!
• When your screencast is complete, upload it to Google Video, YouTube or your internet video provider of choice. Make sure that your provider has “embed” code so we can post your video here on Lifehacker.
• Email the link to your screencast to tips at lifehacker.com with the subject like Shortcut screencast.
• Just because you send us a screencast, doesn’t guarantee it will get posted. We’ll pick the ones that tickle our fancy the most. If there’s any doubt about whether you’ve produced the video yourself, we’ll pass. Getting Lifehacker onto the screen is a sure way to let us know that you made this yourself.

Readers who get their screencasts published here on Lifehacker will win a book. (No votes - if we feature your ‘cast, you get a book). If you’ve never screencasted anything before, we recommend Wink for Windows (free) and iShowU for Mac. Keep in mind that most video sites only support very small screen areas (like 320×240) and screens are illegible when they’ve been reduced in size, so do zoom into smaller areas when the viewer needs to read the text on the screen.

We can’t wait to see your screencasts, so get to submittin’! Questions? Hit us up in the comments.

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All platforms with Firefox: Open-source extension SafeHistory bolsters your browsing security by protecting you from visited-link-based tracking techniques.

[SafeHistory] restricts the marking of visited links on the basis of the originating document, defending against web privacy attacks that remote sites can use to determine your browser history at other sites. A link on a.com pointing at b.com will only be marked visited if you previously visited the b.com page with a referrer in the domain of a.com.

Developed by the creators of previously-mentioned SafeCache, SafeHistory is a free download that works anywhere Firefox does. Thanks, iqag!

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Windows/Mac/Linux (Firefox): The Search Marker Firefox extension places tick marks along your Firefox scrollbar to indicating the location of all matches for an inline Firefox search.

Using it is easy. Just search a web page using Ctrl-F or the backslash and watch as Search Marker marks off all the matches. Move the scrollbar to the location of one of the ticks and you should find a match. This extension may not be for everybody, but if you do a lot of inline searches, especially of long documents, it’s really handy. Search Marker is free to download, works wherever Firefox does.

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