I am the author of the pages and when I open these pages as stored in my hard drive, Firefox (Vers 3.0.16) opens the pages OK.
However, when I request one of these page from the website server, Firefox (same version) displays the page as if it could not 'see' the script.
When I look at the Error Console, I see that it displays the error message: Permission denied to get property Window.API (the error message appears to refer to the corresponding javascrip (.js file)
Internet Explorer 7 opens the same pages without any problem.
No problems here with that page with Firefox 3.6.13 on Linux.
Reload the web page and bypass the cache with:
See Keyboard shortcuts - Perform common Firefox tasks quickly and Use mouse shortcuts to perform common tasks in Firefox
Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).