The plugIn-Container of the versions 3.6 to 7.0.1 crashes, only Firefox 3.5.19 is working. Hello, I have a system AMD Athlon 64 2x 6000+ with windows XP Pro sp3 with 32 bit, dual core. One year ago, when I changed to Firefox 3.6.11 (I don't know what it was before) Firefox crashed each time when I click on "tools/options", "File/open File" or if I try to download a file. The same happened with any version starting with 3.6.0 There is no message : the program is not responding, the sand clock is running and nothing happens: The program does not respond any more. I reproduced this about twenty times. I have running the 4.0 beta version and the 3.5.16 version simultaneously. The only answer I found in the internet is to change the name from firefox.exe to some other name (firefox1.exe). This didn't work in my case. Now in the end of 2011 - I used firefox without problems the last time - I was forced to establish a new system. I installed successfully firefox 7.01. and there was no problem for 3 days. Now after a cleaning operation and some new installations I get the same error again. Last time I thought it was solved for the version 4.0 but this seems only to be resolved by chance. It is especially striking that using Firefox 3.5.19 after all that time, even using exactly the same (!!!!) profile as I used before with the version 7.0.1. Firefox 3.5.19 simply disables incompatible plugIns without crash and works great. So the solution for this crash is clearly using firefox 3.5.19 even if this is not satisfactory concerning the plugins compatible and available.... If there is any method to analyze exactly what happens I would like to try it. I only found out by looking in the administration tool of windows that the plugIn Container crashes all the time - with or without loading any plugIn. Starting in safe modus and several new clean installations didn't change anything. I have firefox 3.6.13 running on another (Intel)system without problems but any version starting with 3.6 is not compatible on my AMD system. I would like to upgrade again my firefox one day - but if this is not solved I will not be able to..... There are other people in the internet with the same problem - anyway to change the name from firefox to firefox1.exe is not a solution - in the best case a work-around (if it works - but not for me). Please help me. So it is already the second time that firefox crashes on my system each time I wanted to open a file or want to download. The same is valid for Export or import a backup. It seems that the first time - so some time ago already - also clicking on options crashed which is not the case now. What a horror to be forced to use internet explorer against ones will .... sincerely Thommy7571