Works if I force a full reload with Ctrl+Shift+r, but a regular reload stalls part of the way down the page. Not sure what it is; advertising code can be complex to unravel and can change on reload, so quite a headache to debug.

I do notice a few errors in the console (Ctrl+Shift+j) including:

TypeError: window.addEvent is not a function
Source File: http://www.paycheckcity.com/calculator/netpay/us/arizona/calculator.html
Line: 84

Not sure what is dependent on that event handler.

Thanks for the quick response.

Yea the page will initially load sometimes then a reload will break it. The error in the console has to do with a joomla module. I stripped out joomla in my dev environment and the bug is still present.

I've noticed that if I only have one ad it works. Something about repeating the script tags for google and or openx causing this problem. When it comes across the 2nd or 3rd instance of the ad script it gets stuck. Not an issue in the past nor in other browsers.

It's only a problem for the few users who don't block ads. ;-)

But seriously, can you create some simple test pages for testing the different combinations of ad scripts and see whether you can spot a pattern?

It works if I disable the HTTP cache (network.http.use-cache -> false), so it looks that Firefox is caching something that needs to be refreshed from the server.

Thank your for the answer. That does seem to make it work correctly. I noticed that this parameter is also set to true in firefox 13 and our site works there. Any idea how I can find out what changed?

Any idea how I can find out what changed?

Hundreds of things change in each release, so I can point you to a list, but often that doesn't lead quickly to a useful answer: https://www.mozilla.org/en-US/firefox/14.0.1/releasenotes/buglist.html