TypeError: aUrl is undefined

TypeError: aUrl is undefined chrome://browser/content/urlbarBindings.xml
It points to the following code:
<pre><nowiki><method name="_parseActionUrl">
<parameter name="aUrl"/>
<body><![CDATA[
if (!aUrl.startsWith("moz-action:"))
return null;
// url is in the format moz-action:ACTION,PARAM
let [, action, param] = aUrl.match(/^moz-action:([^,]+),(.*)$/);
return {type: action, param: param};
]]></body>
</method></nowiki></pre>
What might cause this error? 
I get it on startup, and later (SOMETIMES) just moving the focus from the Urlbar and back again initiates another error.
If I start Fx in a safe mode from a regular mode, it happens as well. 
If, however, I start Fx in a safe mode from a safe mode it doesn’t happen.
Thank you.

Try a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 18.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*(32 bit Windows) C:\Program Files\Mozilla Firefox\
*(64 bit Windows) C:\Program Files (x86)\Mozilla Firefox\
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*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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TypeError: aUrl is undefined

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