Firefox is the most  popular browser and is open source(oops we all know)....
 
Tricking with firefox and Playing withit is a lot of fun.There Is A Simple And Funny Tricks To Time pass And Fun.

 
image
funny firefox
Copy And Paste Below Codes And Address Bar See The Effects

Code:
chrome://global/content/alerts/alert.xul

IT SHOWS Dancing Firefox. 

Code:
chrome://browser/content/browser.xul
IT Opens another Firefox inside a tab in the the existing Firefox window.


Code:

chrome://browser/content/preferences/preferences.xul 
IT Opens the Options dialog box inside the Firefox tab.
Code:
chrome://browser/content/bookmarks/bookmarksPanel.xul
IT Opens the “Book Marks Manager” inside a tab in the Firefox window.

Code:
chrome://browser/content/history/history-panel.xul
 
IT Opens the History Panel in the Firefox tab.
Code:
chrome://mozapps/content/extensions/extensions.xul?type=extensions
IT Opens the Extensions window in the current tab.

Code:
chrome://browser/content/preferences/cookies.xul

IT Opens the “cookies window” inside a tab in the Firefox window.

Code:
chrome://browser/content/preferences/sanitize.xul 
IT Opens the “Clear Private Data” window inside the current tab.

Code:

chrome://browser/content/aboutDialog.xul 
IT Opens the “About Firefox” Dialog box inside the tab.

Code:

chrome://browser/content/credits.xhtml
IT A scrolling list of names. The one’s who we must thank for creating Firefox