Firefox Safari Broken by 10.5.6? HSBC Facebook + Others not working!

Question

Hi All,
This is driving me mad. And I've tried everything I can think of to resolve it. Facebook, hsbc, warehouseexpress and a few other sites that I can't remember at the moment aren't functioning properly on my computer:
PPC G5, 10.5.6.
My default browser was Firefox 3.0.7, I've tried safari 3.x, and 4. I've reinstalled 10.5.1 (not a clean install) the websites still didn't work. I've run software update and updated the java, safari and everything else I use. Here are the problems with each of the sites:
http://www.facebook.com - can log in, but that's it. No other page will open. Eventually firefox just stops loading.
http://www.hsbc.co.uk - Can't add, cancel or ammend payments or direct debits, or send messages to HSBC. For instance, I click on my messages, click new message, select the account and subject, click continue and nothing happens. Eventually HSBC says: We are unable to deal with your request. Please try again later. (085)
This is what shows up in the error console in firefox, but i have no idea what it means! Apprarently, no event has been defined, line 11
"<!--
function OnClickHandler()
var agent = navigator.userAgent.toLowerCase();
if ( (agent.indexOf("msie") == -1) || (agent.indexOf("mac") == -1) )
var el=null;
var flag=true;
el = event.srcElement;
while (flag && el)
if (el.tagName == "A")
flag=false;
if (el.protocol == "javascript:")
execScript(unescape(el.href), "javascript");
window.event.returnValue = false;
else
el = el.parentElement;
} // end OnClickHandler()
document.onclick = OnClickHandler; // set the On click handler for the document
//-->"
I know there was an issue with safari, but that's meant to have been resolved now.
http://www.warehouseexpress.com - Can't sort results by price. Eventually this error appears:
"Connection Interrupted
The document contains no data.
The network link was interrupted while negotiating a connection. Please try again."
http://www.warehouseexpress.com/category/basecategory.aspx?cat03=3037
Is anyone else having this problem? Has anyone else had this problem and managed to fix it? What did you do if you did? I'd be eternally grateful for any help what so ever!!
Cheers,
Chris

Answer 1

it's happening the same to me, neither firefox nor safari can open much more than the google pages (gmail, google search, blogger).
I've spent the afternoon talking to the apple support through the phone to finally get to nowhere and having had to reinstall the mac os, then only safari, etc.
Skype is working too.
It's not something to do with the internet services because I plugged another computer and it works perfectly ok...