Introduction: Firefox Pranks!

Picture of Firefox Pranks!

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

Picture of 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

Picture of 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

Picture of 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

Picture of 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

Picture of 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?

Picture of 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

Picture of For Real

Ya know?

Source code

Step 8: Watch It

Picture of Watch It

Sometimes the page keeps loading forever...

Source code

Step 9: Dsmvwlr

Picture of Dsmvwlr

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

Source code


bauerbach (author)2014-05-09

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

applepeave (author)2012-04-01

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..

JJohnson1701 (author)2012-01-31

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?

knex builder36472418 (author)2010-11-17

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

individual128 (author)2010-04-01

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?


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 ;)

Really?  Whatever.

gummypaul (author)2010-04-02

Don't be messin' with my firefox now. : )

the_burrito_master (author)2010-04-01

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


Lol jk.

godofal (author)2010-04-01

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....

travisttt (author)2010-03-19

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

travisttt (author)travisttt2010-04-01

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?

Xxgold (author)2010-03-31

How come i cant download?

compgeek_brad (author)2010-03-31

 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)

I don't have the GM scripts, but the source doe is in each step. Shouldn't be too hard to remake.

m4573rk3yb04rd (author)2009-04-03

Does it only work on april fools day, or what?

zascecs (author)m4573rk3yb04rd2010-03-31

Ahh, I guess every day is fine...

no, i downloaded the sarcasm enhancer a few days ago

fruitkid101 (author)2010-03-31


erikals (author)2009-05-25

this 'devils inbox' trick is based on an interesting number in the bible which is 666. The Devil is generally associated with the number, as is a weird character also mentioned in the Bible who we know as 'The Beast'. Who could this character be? We've only to wait and find out.

lunchboxslayer27 (author)erikals2009-05-30

either michael jackson or rick astley..

or Steve Jobs

erikals (author)lunchboxslayer272010-02-26

we don't know. I told you that.

NamasteNick (author)2009-02-04

is it easy to undo?

erikals (author)NamasteNick2010-02-26

Yes. Click Tools>Add Ons, then click the 'gmailinboxer' addon and choose Uninstall. When prompted, click 'Uninstall'. Wait until you see a notice that says 'Restart Firefox to apply your changes.' Next to that notice there will be a button that says 'Restart Firefox.' Click that, then wait a while for Firefox to install the add on and open up again.

joejoerowley (author)2008-03-28

Wow this is great!! Wonderful. The only I would do is change the rick roll link to this. I like it more.

lol i clicked on the link and it was pretty funny how did u make it? plz tell me

I did not make that. But I did make a similar one.
Here! Enjoy, :)

timothymh (author)joejoerowley2010-02-14

 Why is everyone acting so annoyed?

Kwitmeh3 (author)joejoerowley2009-06-19

i hate you

I will eat your soul. That drove me crazy.

will421 (author)PhotoshopMan2009-05-06

Right-click Firefox`s part of the bar and click maximize and then you can close the tab.

peach_fart (author)joejoerowley2008-09-19

i noticed it moves away from the back button and makes it go back to the same page. but to get out of it really easily, just click the arrow by the back button, scroll down and click the last page you were on.

jj32x (author)joejoerowley2008-08-31

thats... annoying. i miight change my mates homepage to

damn you

fwjs28 (author)joejoerowley2008-05-13

lmao that was annoying i just did ctrl+alt+del and ended Firefox cuz it wouldnt go away.....lmao.....

eviltechie (author)fwjs282008-07-15

I just did Ctrl+W to close the tab.

Audey (author)joejoerowley2008-04-15


bmlbytes (author)joejoerowley2008-04-01

I hate you.

joejoerowley (author)bmlbytes2008-04-01

Did you know instructables has a "be nice" policy, jk:)
April Fools!
If you want to squirt me with a squirt gun remotely using a live web interface go to this site. I made it from scratch. Enjoy!:)

bmlbytes (author)joejoerowley2008-04-01

Nice try though. I've learned to check your links before clicking them.

joejoerowley (author)bmlbytes2008-04-02

No, it honstly is a squirt gun. I might not of been in my office at the time though.

Kwitmeh3 (author)joejoerowley2009-07-27

that is still the same one, i checked the link like bml did

pyro13 (author)joejoerowley2008-07-18

Dude, that is awsome! can you please PM me on how to make a link do that?!

GreenDay (author)joejoerowley2008-04-01

I wasn't expecting the pop-ups again!

Whew, for once I'm GLAD my proxy blocked it.

Wow, that's nasty. I still like the link we have, though as it doesn't force you to shut everything down.

zachninme (author)fungus amungus2008-03-28

Argh, I just went through that link, it was fun!!

Seriously, though, considering how often this can happen at times (by 5 o'clock on the Combo Pack, it can reach up to 10%!) I wouldn't want anyone to go through that so often.

joejoerowley (author)zachninme2008-03-28

Yeah, that would suck really bad. I would pull my hair out. There are a few select people how ever that are in need of such punishment. (Bush, wink wink)

About This Instructable



Bio: I like to make things for the internets. I also sell a pretty cool calendar at You'll like it.
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