I am facing the same problem .
I am sending a synchronous Ajax request so that further processing by browser does not happen until data gets fetched.
Everything works fine in versions till firefox 2, but does not work in Firefox 3.

I.e synchronous requests dont work.

Asynchronous requests work but i dont need them

Hi Bobby, try disabling Firebug to see whether its debugging features are interfering.

If that doesn't help, as a "three minute" diagnostic, you could try creating a new "clean" Firefox profile: Creating a new Firefox profile on Windows @ MozillaZine Knowledge Base. It will look "factory fresh" except that it will pick up the plugins installed on your machine.

If that works, then you might have had a bad conversion from Firefox 2, or one of your extensions may be at fault, or a bad setting, or a corrupted file. If the cure isn't obvious, you can move your bookmarks and (selectively) your other settings to the new profile: Transferring data to a new profile - Firefox @ MozillaZine Knowledge Base.

Any luck?

I had Cooliris installed as an extension which gave me the "Component does not have requested interface..." message. Once I removed it all went back to normal.

I am also having the same problem. I installed 3.0.1 last night and now none of my javascript on my websites is working. Whereas, it was working on the old version.

After installing Firefox 3.0.1, it doesn't run and nor does version 2. The following message comes:

"Firefox had a problem and crashed. We'll try to restore your tabs and windows when it restarts"

But subsequent to reloading, restarting the machine, it keeps on displying the same message.

Please help ASAP.

Regards

But... it's true?!? I've tested my website with this release (3.1b1) and - apparentley - I've the same problems!! :(

I am also having the same problem. Damn!! How to rollback to FF2 version?????? :((((

I've worked around this problem for all browsers that users need to access my web application with (FF 2.0.x, FF 3.x including 3.0.x, IE 6, IE 7, Safari 3.x on Mac and Windows).

This was the code BEFORE the changes, the code did not work as it did either not do a synchronous call correctly (FF 3.01), or it did not call the onreadystatechange handler function (FF 2.0.0.15 to .17):

function determineAdm() {
var xhr = getXmlHttpRequest();
var postParams = "isAdm=1";
xhr.open("POST", "../someBackend.do", false);
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
if (xhr.status == 200 || xhr.status == 304) {
alert(xhr.responseText);
}
}
}
xhr.send(postParams);
}

I changed it like can be seen below, and now it wors in all the browsers mentioned at the top of this posting (even in FireFox 3.01):

function determineAdm() {
var xhr = getXmlHttpRequest();
var postParams = "isAdm=1";
xhr.open("POST", "../someBackend.do", false);
xhr.send(postParams);
// the above send command blocks as this is a synchronous call,
// so we do not need the onreadystatechange listener to wait
// for the answer but can just pick up the reply from xhr using
// xhr.responseText after the above call:
alert(xhr.responseText);
}

What now puzzles me is that when I enable FireBug in FF 2.0.0.15 to .17, the behaviour with the old code version is ok, i.e. the onreadystatechange function is called correctly. As soon as I disable FireBug, the onreadystatechange function is not called.

Hello,
My Ajax Code works in IE6,IE7,FF2.x. But When I updated to FF3 code stopped working. The problem is xmlhttp.onreadystatechange function is not getting called. Can some one tell me what could be the problem

Hi All

I also had the problem of sychronous Ajax requests not working in FF3.

However, I've just tried the workaround suggested by MarkusW (Wed 24 Sep) - and it's fixed the problem.

In summary, for synchronous AJAX requests:

1) Move all code from the state change handler function, into the main Ajax calling function, AFTER the send command.
2) Remove the state change handler function body
3) Remove the line that defines the state change handler function

(I initially forgot Stage 3 - it won't work unless you do this!).

Hope this helps.