After upgrading to 27, firefox will not start. Saw an error message during the upgrade process.

After upgrading to 27, firefox will not start. Saw an error message during the upgrade process but cannot remember.
Tried to run firefox.exe -P but receive error message:
XML Parsing error: undefined entity
Location: chrome://mozapps/content/profile/profileSelection.xul
Line number 18, Column 1:
<dialog
^
Running on Windows XP SP3. No problem whatsoever before upgrading to 27. Sending this from Chrome as I cannot open Firefox at all.

Thanks jschaer2000: after starting it once in safe mode, I closed Mozilla and tried several restarts in normal mode. So far, all worked:-)
Thank you very much again.
Still the automatic update process bothers me: it took me several days to discover the reason to the malfunction, since when I removed the problematic version from Add and Remove Programs, I didn't pay attention at first that it was another version, not v26 which I installed from my folder.
In addition, I like to save the installation files before I run new programs and if I didn't have v26 exe file, I couldn't have operated Mozilla at all. Not that it was fun to remove and install again each time v27 didn't react, but it was better than nothing, I still prefer Mozilla over its competition.

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4. I disabled my anti-virus & spyware sweeper again and tried with fresh install.
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XULRunner
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I have the same problem as
https://support.mozilla.org/he/questions/985552#question-reply
I have tried everything i could find online. uninstall and re-install. tried even full uninstall, giving up my profile data (i back it up in chrome).
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Finally i downgrade to FF26 - an unofficial version from the web and not of my locale.
You should provide an option to download older versions.
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Hello friend, i have a suggestion:
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[]'s

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After upgrading to 27, firefox will not start. Saw an error message during the upgrade process.

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