When opening a page, FF sometimes hangs for several minutes, the main thread consuming 100% of the running core

I've not been able to detect a pattern of occurrence. It just happened now when I opened this page
http://www.pcinpact.com/actu/news/66460-amd-catalyst-rage-vsync-opengl.htm
soon after starting FireFox (which loaded the dozen tabs - in two windows - of my current session).
Here is the stack of the main thread, as shown in Process Explorer :
ntdll.dll!ZwQueryDirectoryFile+0xa
wow64.dll!Wow64EmulateAtlThunk+0x8c77
wow64.dll!Wow64SystemServiceEx+0xd7
wow64cpu.dll!TurboDispatchJumpAddressEnd+0x2d
wow64.dll!Wow64SystemServiceEx+0x1ce
wow64.dll!Wow64LdrpInitialize+0x429
ntdll.dll!RtlUniform+0x6e6
ntdll.dll!RtlCreateTagHeap+0xa7
ntdll.dll!LdrInitializeThunk+0xe
ntdll.dll!NtQueryDirectoryFile+0x12
xul.dll!??0Layer@layers@mozilla@@IAE@PAVLayerManager@12@PAX@Z+0x1589
xul.dll!NS_NewLocalFile_P+0xb536
xul.dll!?AccumulateMetricsForRun@gfxTextRun@@AAEXPAVgfxFont@@IIW4BoundingBoxType@2@PAVgfxContext@@PAVPropertyProvider@1@IIPAURunMetrics@2@@Z+0xdc07
xul.dll!?AccumulateMetricsForRun@gfxTextRun@@AAEXPAVgfxFont@@IIW4BoundingBoxType@2@PAVgfxContext@@PAVPropertyProvider@1@IIPAURunMetrics@2@@Z+0xf951
xul.dll!?Stroke@gfxContext@@QAEXXZ+0x2ad
xul.dll!?Stroke@gfxContext@@QAEXXZ+0x9ab
xul.dll!NS_InvokeByIndex_P+0x72f99
xul.dll!?SanitizeMetrics@gfxFont@@IAEXPAUMetrics@1@H@Z+0x1048
xul.dll!?Paint@gfxAlphaBoxBlur@@QAEXPAVgfxContext@@ABUgfxPoint@@@Z+0x2e2
xul.dll!?ReleaseTextRun@gfxTextRunCache@@SAXPAVgfxTextRun@@@Z+0x4f6
xul.dll!?TransformToNativeRect@gfxWindowsNativeDrawing@@QAEXABUgfxRect@@AAUtagRECT@@@Z+0x13c
xul.dll!??0ImageContainerOGL@layers@mozilla@@QAE@PAVLayerManagerOGL@12@@Z+0x1318
xul.dll!??0ImageContainerOGL@layers@mozilla@@QAE@PAVLayerManagerOGL@12@@Z+0x142c
xul.dll!??0gfxSkipCharsIterator@@QAE@ABV0@@Z+0x85a
xul.dll!??0ImageContainerOGL@layers@mozilla@@QAE@PAVLayerManagerOGL@12@@Z+0x1444
xul.dll!??0gfxSkipCharsIterator@@QAE@ABV0@@Z+0x85a
xul.dll!??0ImageContainerOGL@layers@mozilla@@QAE@PAVLayerManagerOGL@12@@Z+0x1444
xul.dll!??0gfxSkipCharsIterator@@QAE@ABV0@@Z+0x85a
the last two functions are called recursively over 40 times...

Today, I was able to open the older version of the template if I only viewed the code first.  So I was able to narrow it down to one change I had made.  I had changed:
<link href="/css/960grid.css" rel="stylesheet" type="text/css">
to:
<link href="http://mydomain.com/css/960grid.css" rel="stylesheet" type="text/css">
When I tried to save the document, Dreamweaver hanged.  The document opened fine with all of the other changes I had made, although it couldn't find the CSS files (I had moved the site to another root locally).
This really looks like a bug in Dreamweaver to me.  I've seen CSS links like this in other people's websites, so it does look like valid CSS to me.  Is there a workaround for this?

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