Introduction: Firefox Pranks!

About: I like to make things for the internets. I also sell a pretty cool calendar at You'll like it.
Using add-ons in Firefox to enhance your experience is boring. For April Fools' Day, lets make the experience a little more bizarre.

Since these add-ons were meant to be installed on a victim's computer you'll only need two things:

- a victim who uses Firefox as his or her regular browser
- access to the victim's computer

To keep it simple, here are the links to all of the add-ons for your one-stop shopping pleasure. Each step will explain what each of these does.Just click on a link to install it in Firefox.

- Two Steps Back
- Rick Rollr
(Video removed by YouTube)
- The Devil's Inbox
- Highs and Lows
- Sarcasm Enhancer
- What Did You Say?
- For real
- Watch it
- Dsmvwlr
- Total Confusion Combo Pack!
(Updated 3/30)
- Total Confusion Combo Pack! (non April Fools' Day version)

If you want to hit your victim with everything, you can go for the Total Confusion Combo Pack. The combo pack is set to only work on April 1st, so you can install it now, and nothing will happen until then. Also, throughout the day, the pranks become more and more frequent!

 All of these can be removed simply by going to Tools > Add-ons and uninstalling them.

Scripting byzachninme. Without whom this would not have happened.

These add-ons started out as Greasemonkey scripts and were converted to add-ons with this script compiler.

All code linked to, and mentioned in this Instructable is licensed under the GPL.

UPDATE (3/31/2010): I made these scripts a while ago and haven't tested them since then. Since youtube removed the rickroll video it does not work any more. You are more than welcome to substitute a new video in that script or change any of these for that matter.

Step 1: Two Steps Back

Once in a while the browser will go two links back instead of the next link forward. This is pretty subtle and will definitely frustrate someone and make them think they're going crazy. We recommend that you let them in on the joke before too long.

Source Code

Step 2: Rick Rollr

Getting people to click on links that sends them to the Rick Roll video is hard. They're on to your silly ways, but what if there was a 2% chance that any link, on any page, would Rick Roll them? Yeah, it would drive 'em nuts.

if(Math.random() > 0.98){
   window.location.href = "";

That's a 2% chance of your window being sent to the google page. Tweak the number between 0 and 1 for odds of it happening and the URL for the target video.

Step 3: The Devil's Inbox

If your victim uses Gmail, then get ready to send their Inbox to hell. There's a good chance that their Inbox count will be stuck at 666. The odds of this happening? 66.6%

Source code

Step 4: Highs and Lows

Life can be funny and sad. And by life, we mean the Internet as a whole. But often the text doesn't quite reflect that so we're going to be randomly adding "*sigh*" and "LOL!" to the ends of sentences. Much better now, right?

Source code

Step 5: Sarcasm Enhancer

Do you really believe everything you read? Whatever. Now the whole Interwebs will be as sarcastic as you feel on a Monday morning.

Source Code

Step 6: What'd You Say?

People keep saying things. All over the place it's so-and-so said this, whatsisface said that. Doesn't anybody shout or enthuse or gush their thoughts?

They do now.

Source code

Step 7: For Real

Ya know?

Source code

Step 8: Watch It

Sometimes the page keeps loading forever...

Source code

Step 9: Dsmvwlr

Sometimes you don't need all the letters to read the text links.

Source code
April Fools' Speed Contest

Participated in the
April Fools' Speed Contest