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I have several unused programs in this list and some entries lead to bad behaviour; I'd like to get rid of them completely.

Refer to the screenshot below (note I'm on Windows however)

enter image description here

Does anyone have an idea how to do that? (I don't mind losing the whole list).

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up vote 1 down vote accepted

You can do this as follows. Paste the following string in the program RUN (Windows Key + R) or create a shortcut with it.

%userprofile%\AppData\Roaming\Mozilla\Firefox\Profiles

This will open your profiles folder and there you will find a folder ending with .default. If you open this folder you will find a file called mimeTypes.rdf. First make a backup of this file !

Then click the file and choose Wordpad from the option that Windows gives you when asking what program to use to open the file. (If you would choose notepad the data in the file will be harder to read). Now find the entry you want to delete. For example DOC :

<RDF:Description RDF:about="urn:mimetype:application/msword"
                   NC:value="application/msword"
                   NC:editable="true"
                   NC:fileExtensions="doc"
                   NC:description="">
    <NC:handlerProp RDF:resource="urn:mimetype:handler:application/msword"/>

And remove the entire entry. Keep in mind that some apps have more than one entry. If things don't work out as they should be, you can copy your backup (mimeTypes.rdf) in the folder, and start over. You can delete the file if you want, to delete the entire list.

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