Firefox Pranks!





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

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



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    184 Discussions

    The Rick Rollr video has not really been removed.You can still watch it at

    I love the add on compiler. I have made like ten of these and are now looking to unleash them all.... Just need someone to mess with..

    This is great, but the link to the all-in-one pack failed to download, and the Rick Rollr link was removed. I tried going to Roll Tube and recompiling the source with one of the other rick-roll videos, but it didn't work at all.

    Would there be any chance of this being updated and re-released?

    whats the two steps back installment called- i cant fond it to delete it cause its really annoying my bro :)

    Thanks for sharing these. So funny. I have played with changing the source code, which is great because I didn't know you could make Firefox add-ons so easily. I'd like to modify the Rick-roll code, but the link to the source seems to be broken. Could you check it please?


    3 replies

    I didn't write that one, but I'm pretty sure this will set you on the right track.

    if(Math.random() > 0.8){
       window.location.href = "";

    That's a 20% 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.

    Since many sites have iframes for ads, a single page can have 4 or 5 windows load for what looks like one. We ended up with .98 for the value to avoid it being utter chaos all the time.

    Thanks so much. Brilliant, it worked a treat. I have set one up to redirect to that mind-numbingly awful batman thing:

    My wife is going to hate me ;)

    tsk... with my computer you get this prank all the time "sigh" whoa I must have gotten pranked "lol"!


    Lol jk.

    this is pure evil

    im going 2 use those as a late april 1st prank XD

    its just that no one reminded me of april 1st....

    How could I change the link the person is sent to? Could I easily bother them with other random links?

    1 reply

    OK, I've become slightly smarter and have found where add-ons are stored. Inside of the firefox profile, where can I find this file?

     Is there any chance we could get the greesemonkey scripts??
    the plugins are good but a lot of people i know use Google chrome, which wont support them (but natively supports greesemonkey)

    1 reply