Dear Mme Sir i use windows vista , and when i have try to upgrade my Firefox , i will have the problem that no connection of internet will work, even that other browser such as internet explorer have access to internet. i had follow most of ur support forum in this case and try to unlock my firewall by deleting and then adding Firefox in trusted program NO WAY , i had enter to about .... in address and try modify the IPV6 by making to true NO WAY. am experiment in network problems, so my connection r good and i had try many choices in "option - network ....." I had download and install others versions example 30,30.1,33,40 even 3.0 or 3.6.9 or 3.6.10 also i had try NETSCAPE 9 the same problem. the only solution is to return to version 3.6.3 and then i get internet connection. also in this version, i get the redirect to "googleservice......" all time when trying to browse any site web ,it jammed and freeze to blank white... i couldn't install any add-on reason of no conformity of most of them with this version also when try to force it, i will have error message indicating me that file are not signed, -260 please could you give the solution, because i love so much my fox even with its bugs.... GREETINGS