How to fix a Firefox menu display bug?

Clicking one of the drop down menus at the top, eg. file, tools, help, will display the entire Firefox window I have open instead of the usual options such as "Firefox help" etc. Obviously it is very small as it shrinks the entire window into that box until I move the mouse around, then I can see all Firefox options.
Have tried uninstalling, installing older versions(22 and 23) and resetting Firefox, seems to have happened after I installed an add-on.

Hello,
'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* You can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
''Once you get the pop-up, just select "'Start in Safe Mode"''
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
Thank you.

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Regards, Amir

The following sub.jsp file shows the formatted XML properly as expected when is opened directly:
<% response.setContentType("text/xml"); %>
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<chapter1>chapter 1</chapter1>
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IE11 shows the result as below which are colored and can be collapsed or un-collapsed:
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But if the sub.jsp is opened in an iframe from the below main.html, it only shows the values of the XML in the iframe:
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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The iframe shows only the XML values, i.e., chapter 1 chapter 2 in IE11. This issue does not happen in IE8.
I appreciate to your if you know how to address this issue.
This issue is also posted at below link:
https://social.msdn.microsoft.com/Forums/en-US/5b0692b4-d312-4797-9089-42c1029ac059/how-to-fix-iframe-issue-that-displays-xml-values-instead-of-formatted-xml-in-ie11?forum=iewebdevelopment
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== Operating system ==
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*http://kb.mozillazine.org/Uninstalling_Firefox
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*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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'''''NewTabURL''''': https://addons.mozilla.org/en-US/firefox/addon/newtaburl/
<br />
<br />
'''You need to update the following.''' The Plugin version(s) shown below was/were submitted with your question and is/are out of date. You should update to avoid known security issues with the version(s) you have installed. Click on "More system info..." to the right of your question to see what was included with your question.
*Adobe PDF Plug-In For Firefox and Netscape "9.4.2"
*Shockwave Flash 10.1 r85
*Next Generation Java Plug-in 1.6.0_24 for Mozilla browsers
#'''''Check your plugin versions''''' on either of the following links':
#*http://www.mozilla.com/en-US/plugincheck/
#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
#*'''Note: plugin check page does not have information on all plugin versions'''
#*There are plugin specific testing links available from this page:
#**http://kb.mozillazine.org/Testing_plugins
#'''Update Adobe Reader (PDF plugin):'''
#*From within your existing Adobe Reader ('''<u>if you have it already installed</u>'''):
#**Open the Adobe Reader program from your Programs list
#**Click Help > Check for Updates
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#* Removing old versions (if needed): http://www.java.com/en/download/faq/remove_olderversions.xml
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