Google - Highlight harmful site alert

Added by David McRitchie@userstyles, Created: Jan 15, 2011, Updated: Jan 16, 2011
  • With the style applied
  • With the style applied (Generated screenshot)
  • Without the style applied (Generated screenshot)


Adds reddish highlighting for Google search results with "This site may harm your computer.". Firefox itself should prevent you from accessing such sites identified by as both Mozilla, Google, and several others are partners.

The highlighting will help you avoid clicking on the site.

Even though Firefox uses the same data, there will be timing differences between what is available from Google servers and what Mozilla has downloaded to you for your protection.

More info
Make sure that your Firefox Tools, Options, Security you have checkmarked both
[x] Block reported attack sites (default)
[x] Block reported web forgeries (default)

If you have "Customize Google" extension and choose to show web favicons, the favicon changes to a white exclamation point on a red sphere as a warning on such sites, but the favicons disappear if you are signed into Google, so this change should show when you are getting a lot of malware search hits.

I no longer use "Customize Google" (obsolete), nor "Optimize Google, but do use "GoogleEnhancer" -- for more information on why, see the large table of extensions at

For your protection you should have "Adblock Plus" extension with a subscription filter such as "EasyList" subscribed to after installing, plus adding filters of your own (your personal filters and each subscription are kept separate so you can update subscription filters any time). You should also protect yourself with a hosts file such as obtained through

Firefox provides for reporting bad sites via Help --> Report Web Forgery...
or you can report directly through and their submittal form

I have this code in (16842) but the code should be in its own style. The code is a segment from (16887).

I have no control over the layout of this page at, each revision has made all of my before and after pictures harder and harder to view in context.

Updates: since 2011-01-16: (none)

Applies to:,,, http://google

Related styles:

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