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Updated To New Firefox Quatum Getting Error Message

Can anyone tell me what this is and how to fix in simple terms.

When I click the Firefox Icon to open it I get the following message with a yellow triangle and just a button Okay.

[Exception... "Could not convert JavaScript argument arg 0 [nsISupports.QueryInterface]" nsresult: "0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)" location: "JS frame :: resource://cck2/Preferences.jsm :: get _prefSvc :: line 544" data: no]

get [EMAIL="_prefSvc@resource://cck2/Preferences.jsm"]_prefSvc@resource://cck2/Preferences.jsm[/EMAIL]:544:19
[EMAIL="_get@resource://cck2/Preferences.jsm"]_get@resource://cck2/Preferences.jsm[/EMAIL]:87:1
[EMAIL="get@resource://cck2/Preferences.jsm"]get@resource://cck2/Preferences.jsm[/EMAIL]:81:12
[EMAIL="init@resource://cck2/CCK2.jsm"]init@resource://cck2/CCK2.jsm[/EMAIL]:149:25
@cck2.cfg:68:1

Thank you for your help.

I use Windows 10 and laptop is a Compaq CQ58

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