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Sometimes, when I'm browsing a random site, suddenly a 0 byte PHP file will be downloaded out of nowhere and Firefox (3.5.2) will start opening it in multiple tabs really quickly, so that I have to press Ctrl + W (close tab) as fast as I can until all the rogue tabs are closed. This file is frequently named diggthis.php, and some time ago it was a name I can't remember but it was the name of a search engine.

Could this be malware on my computer? Maybe a XSS attempt in the page I'm browsing?

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upgrade to 3.5.3 – joe Sep 10 '09 at 22:36
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This is very much likely malware on your computer. Use nice little proggie malwarebytes antimalware. Then install NoScript plugin to Firefox and you'll be a happier person.

Really - NoScript helps prevent 90+% of malware by effectively disabling entry points. You will need to manually allow scripts on trusted sites, but this thing is worth a few clicks now and then. I mean, it is so effective against malware that I can't find a sane reason why not have it.

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+1 for mentioning Malwarebytes Antimalware - the app can't get enough publicity – Ciaran Sep 10 '09 at 22:41
I know about NoScript, and I used it for some time, but I found it too annoying. – Javier Badia Sep 10 '09 at 22:51
Well, you are not the first to notice it is annoying :) It's a subjective, tho. I rather have clean computer and simply click Temporary allow xyz.abc or Temporary allow everything on this site if I believe the site is trustworthy, than cleaning malware three times a month. :) – imagodei Sep 11 '09 at 6:19
Nice answer. +1 – D'Arvit Sep 11 '09 at 9:08
The antivirus detected some malware. I'll mark this answer as accepted if for a few days the problem doesn't happen again. – Javier Badia Sep 11 '09 at 17:05
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