Firefox won't start after 18.0.1 upgrade

I have upgraded to the latest version and then two days later, The mozilla Crash reporter opens and it won't start. Nothing happens when I press details.
I can't run it safe mode. The same thing happens.
I uninstalled and re-installed and same thing.
I then uninstalled rebooted and re-installed V16. That was then ok for a few days then same thing happened.
So I unintstalled rebooted and on went V15 which worked for about 8 hours. However I can't get any version to work now. The Crash Reporter pops up whatever version I have.

We're sorry to hear that your Firefox seems to be crashing when you open it. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash.
#Press the following shortcut to get a Run window: [Windows] + [R]. This should bring up a window that contains a text field.
#In that text field, enter %APPDATA% and press Enter. An explorer window should open.
#From that explorer window, double-click on the ''Mozilla'' folder, then double-click on ''Firefox'' and then on ''Crash reports''. Double-click on ''submitted''.
#Now, you should see a list of files that contain reports. Go to ''View'' > ''Arrange Icons by'' > ''Modified'' to get the most recent files at the top of the window.
#Open the most recent 5 files with a text editor and copy the IDs.
#Paste each ID into the reply window on the forums.
Thanks in advance!
You can find more information and troubleshooting steps in the [[Firefox crashes]] article.

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XML Parsing Error: undefined entity
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Line Number 14, Column 1:
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^
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I cheated a little bit and put the issue url in a working version of firefox:
chrome://mozapps/content/extensions/update.xul
What I got was a page that looked like this below and console:
blah blah parser:
<pre><nowiki> xml-stylesheet
xml-stylesheet
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<wizardpage id="versioninfo" pageid="versioninfo" next="mismatch" label="Checking Compatibility of Add-ons" onpageshow="gVersionInfoPage.onPageShow();">
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[http://www.mozilla.org/en-US/firefox/new/] in a private window will give you a new install or you can choose from here: [https://www.mozilla.org/en-US/firefox/all/]
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Firefox won't start after 18.0.1 upgrade

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