User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b5) Gecko/2008041514 Firefox/3.0b5 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b5) Gecko/2008041514 Firefox/3.0b5 Sometimes, firefox (3beta5) seams to write (according to the system monitor in Ubuntu it is write, but I am not 100% sure). I don't know how it starts, or what causing it to act like that. The following error message appeared in the error console: Error: uncaught exception: [Exception... "Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIIOService.newURI]" nsresult: "0x804b000a (NS_ERROR_MALFORMED_URI)" location: "JS frame :: file:///usr/lib/xulrunner-1.9b5/modules/utils.js :: PU__uri :: line 152" data: no] Maybe it has something to do with it... If I can help in some way, just guide me and I will be glad to help. (If there is some option to log all firefox I/O stuff...) Ofir Reproducible: Didn't try Steps to Reproduce: 1. 2. 3. Ubuntu 8.04, almost clean install (less than a week). Extensions: qtl, ad block, greasemonkey, yslow, flashblock, better gmail 2, flashgot, user agent switcher and ubuntu extension which comes pre-installed. Theme: original I experienced it also with a clean profile of firefox, so it might not be only the extensions fault.