I run Firefox nightly builds and I noticed this "Known Issue workaround" The <a href="http://X.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">X.org</a> X server may perform poorly or hang when running Gran Paradiso. This can be mitigated by adding <tt>Option "XaaNoOffscreenPixmaps" "true"</tt> in the "Device" section of xorg.conf. I have not tried it at all as I don't have this issue, but it might be worth trying. <div> On 9/2/07, Jim Kronebusch <<a href="mailto:jim@winonacotter.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">jim@winonacotter.org</a> > wrote:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Problem solved (or at least identified).  Firefox has a bug if you want to call it that, that caches pixmaps to X11.  This can chew up all available RAM in a hurry and once full completely freezes the client.  There is a hack you can put into ldm that will not allow any application to consume 100% of RAM causing the app to crash upon request of too much RAM, but at least keeps the client running.  But this still doesn't allow you to open certain websites.  Upon testing of other browsers (thanks to Robert Arkiletion) I found that if you have Firefox working the way you want, just apt-get install opera and your good to go.  Now I know that Opera isn't exactly the preferred client and also isn't "free" software, but if you're having trouble with Firefox crashing your clients, this is a good workaround until a way to keep firefox from caching pixmaps is found. Also modifying the default nbdswap size from 32MB to whatever you need to handle certain sites (the ones some of our students ran into required a minimum of 500MB) helps.  But this can quickly use up HD space on the server, create more network activity, and is slower than the use of RAM.  So although this works as well it is not a perfect solution. However if you absolutely need to use Firefox addition of the ldm hack along with the nbdswap increase, things should be very usable although not ideal. If anyone wants a good pet project....please find a way to disable firefox from pixmap caching to X11.  It looks like many could benefit from this. I will post in 2 separate posts a howto for addition of the xramperc option in ldm and how to increase your nbdswap. Thanks, Jim -- This message has been scanned for viruses and dangerous content by the Cotter Technology Department, and is believed to be clean. -- edubuntu-users mailing list <a href="mailto:edubuntu-users@lists.ubuntu.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">edubuntu-users@lists.ubuntu.com </a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/edubuntu-users" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"> https://lists.ubuntu.com/mailman/listinfo/edubuntu-users</a> </blockquote></div> -- Please avoid sending me Word or PowerPoint attachments. See <a href="http://www.gnu.org/philosophy/no-word-attachments.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"> http://www.gnu.org/philosophy/no-word-attachments.html</a>