User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; es-ES; rv:1.8.1.12) Gecko/20080201 asd Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; es-ES; rv:1.8.1.12) Gecko/20080201 asd If i go to about:config and add a new chain called "general.useragent.extra.firefox" and alot of text it makes a buffer overflow and can't display the web pages! Reproducible: Always Steps to Reproduce: 1. Go to about:config 2. Add a new chain called "general.useragent.extra.firefox" 3. Put in value a lot of text Actual Results: The web pages can't be displayed

What happens when you try to load a web page with a super-long user agent? What makes you think this is a buffer overflow?

When i try to load a web page it can't be displayed, i see it: Se ha reiniciado la conexión La conexión al servidor fue reiniciada mientras la página se cargaba. * El sitio podría estar temporalmente no disponible o saturado. Vuelva a intentarlo en unos minutos. * Si no puede cargar ninguna página, compruebe la conexión de red de su ordenador. * Si su ordenador o su red están protegidos por un cortafuegos o un proxy, cerciórese de que se le permite acceder a la Web con Firefox. --------------------------------------------| It's in spanish (i have a spanish firefox version) ------------------ I think it is a buffer overflow because when i go to: Help -> About my PC don't response ----

Bug 451944 is crash case upon PDF open(nppdf32.dll plugin of Adobe 9.0.0 is used), with additional two general.useragent.extra.xxxx. To Phanter Root(bug opener): Get NSPR log with "all:5". Does line like "nsPluginHostImpl::UserAgent return=(null)" exist? What is set as "User agent string" in HTTP header by Firefox? Who issued the message in comment #2. Firefox or plugin or extension? Or Web server?

Crash of Bug 451944 didn't occur with Fx trunk build. To Phanter Root(bug opener): Can you reproduce problem with Fx latest-trunk?