The reasons why Firefox kicks ass are many and well documented, but the one relevant to this topic is its extensibility. GreaseMonkey is one such extension. Wired has a good article on it, but if you’re lazy…
GreaseMonkey allows Firefox users to use site-specific scripts to alter the look or behavior of websites that they visit. For instance, if you use Netflix, but you like to read about movies on IMDB, you can enable a script to display a “Add to my Netflix queue” link on each movie page on IMDB. Another script bypasses the interstitial ad pages and in-content ads on IGN.com. Well done geeks!

Don’t want to give some company your demographic or personal information in order to view the content of their site? BugMeNot.com is a great way to bypass registration for a number of websites. I have no idea how many or what types of site it has information for, but I’ve tried it on news sites like NYT and Washington Post, but it works great. You just go to BugMeNot.com and enter the URL of the site you want to view. It gives you a valid login and pw. Alternatively, the have a Firefox extension so you don’t even have to visit the BugMeNot site. Not using Firefox? Well, you frickin should.

Some Swede has designed a glowing door handle called Brighthand. It lights up red when the door is locked and green when it’s unlocked. Only available in Scandinavia. Aside from looking toyishly like lightsabers, these will only uncourage laziness among Nordic burglars.

This site is having a contest on who can Photoshop modern technology into antique contexts. Some of the entries are clever… some not so much.

Found in the Atlanta airport. I wonder if it accepts quarters.

This Java applet is a visualizer for the history of music sampling. A timeline with colored dots represents some of the most widely circulated tracks; click to see all the tracks they spawned, click the tracks they spawned to see what other tracks they sampled. Nice.

Portable Firefox is a version of the Firefox web browser that’s been optimized for USB keychain drives. Well done, geeks. Suck it, Bill.

This is a foot pedal that you hide under your desk at work. When Lundberg strolls up to your desk you give the pedal a tap with your foot. Only a moment ago you were in an intense game of Doom 3 (or Minesweeper), but after the tap all Lundburg sees on your screen is your TPS report in progress. As soon as that asshat leaves, another tap returns you to cyberdemon fragging bliss. Make sure you watch the demo.

Caveat: This found under features:

• Play distinctive StealthSwitchâ„¢ sound when hiding windows