Firefox won't start (after downloading Xmarks update)

Hello, this morning I downloaded Xmarks update since that point in time I am unable to open Firefox. I reinstalled the browser a couple of times and I am still unable to open the Firefox. Any ideas? Please.
I use Mac OS X 10.6.4
== This happened ==
Every time Firefox opened
== After downloading Xmarks update. ==
== User Agent ==
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-us) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0 Safari/533.16

@acdeag - Same here w/ regards to Greasemonkey. I've also got trouble w/ the 1Password browser integration. I can't find much about it either. Extremely frustrating.

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Firefox won't start after download and update

I have win 7. I uninstalled Firefox and downloaded it again.
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XML Parsing Error: undefined entity
Location: chrome://mozapps/content/extensions/update.xul
Line Number 14, Column 1:
<wizard <="" ^="" id="updateWizard" p=""></wizard>
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"There is no disk in the drive-insert a disk into drive/device/hard disk4/dr4
I uninstalled Firefox several times , still no luck
I hope you can help me resolve this problem.
Dkmc7

Well I use system restore to an earlier date in May.
Then I uninstalled all Mozilla files and then I reinstalled Mozilla 29.0.1 and
now my Firefox Mozilla is working fine with all info in my profile intact.
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After windows Updated my computer Firefox won't start. I tried a clean reinstall two times, won't work. When I tried to start the firefox the first time after booting my computer it comes with the following message.
XML Parsing Error: undefined entity
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Line Number 14, Column 1:
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^
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Thanks
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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
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blah blah parser:
<pre><nowiki> xml-stylesheet
xml-stylesheet
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Firefox won't start (after downloading Xmarks update)

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