There are no popups on Firefox by default. I suspect you've installed something which has caused them, or have been hit by a so called drive-by malware download.

What I suggest you do initially is to download the free version of Malwarebytes from http://www.malwarebytes.org/products/malwarebytes_free and run a full system scan to eliminate malware as the culprit as is often the case.

Then come back to Firefox and install this Adblocker: https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/

If the problem persists, please post again in this thread.

Just noticed some plugins which are out of date and which expose your system to attack. See http://www.adobe.com/support/security/advisories/apsa11-02.html

• Update Flash via http://get.adobe.com/flashplayer/
  
  
• Update Java via http://www.java.com/en/
  
  

So the box that is stating: "Be a web hero! Help someone you know upgrade to Firefox 4 today"! is not coming from you???

Oh, this is indeed a stupid move by Mozilla! Here's the link: http://www.mozilla.com/en-US/firefox/webhero/

I can't think what they're trying to achieve with a childish campaign like this one.

I think if you install this add-on, it will filter this junk out: https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/

Are you referring to the "snippets" that appear on the default about:home homepage, below the Search container?

The easiest way of fixing that is to set your own choice of a homepage. Or change to the homepage that was used in previous versions of Firefox.
http://www.google.com/firefox

You can hide the box that shows the snippets with code in userChrome.css

Add code to userChrome.css below the @namespace line.

• http://kb.mozillazine.org/userChrome.css
• http://kb.mozillazine.org/Editing_configuration

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

/* hide snippet container on the about:home page */
#snippetContainer { display: none !important; }

You can use the ChromEdit Plus extension to have easier access to the customization files, from within Firefox.

   * ChromEdit Plus: http://webdesigns.ms11.net/chromeditp.html

<- from: /questions/822755 - c ->

Just change the home page to a regular google site.

• Go to http://www.google.com.
  
  
• Click the orange Firefox button and go to Options | Options | General
• Make sure it says "Show My Homepage" in the first dropdown menu.
  
  
• Click the button called "Use Current Pages" to set the homepage to the one you have on the screen.