SWFObject 2.2 uncaught exception with FireFox 4

What steps will reproduce the problem?
1. Install a fresh FF 4.0.1
2. Install las FP 11.5 r502.
3. Execute the test 
http://www.bobbyvandersluis.com/swfobject/testsuite_2_2/test.html

What is the expected output? What do you see instead?

I expect the Flash movie with the version info.

I get a blank screen and this error in the console:

Error: uncaught exception: [Exception... "Failure"  nsresult: "0x80004005 
(NS_ERROR_FAILURE)"  location: "JS frame :: 
http://www.bobbyvandersluis.com/swfobject/testsuite_2_2/swfobject.js :: 
<TOP_LEVEL> :: line 4"  data: no]

What version of the product are you using? On what operating system?

FF 4 (the same happens with 5, 6, 7 and 8, in FF 9 the error gone)
FP 11.5 r502 (last version).
Windows 7 Pro x64

Please provide any additional information below.

The error happens in the line 201 of 2.2 source:
if (typeof t.GetVariable != UNDEF) {

I don't know if it is a FP error, the plugin is supposed to work with FF4+.

Original issue reported on code.google.com by wjl...@gmail.com on 28 Jan 2013 at 10:44

namouch / swfobject

SWFObject 2.2 uncaught exception with FireFox 4 #651