How to remove search providers in late 2014 Firefox?

The latest Firefox (now v. 34) has changed the way it administers search providers, so that they can be selected or un-selected, also new ones can be added, but they cannot be removed.

That is annoying me because I use the addon Context search which gives a context menu search option for the selected text which now shows all the search engines ever added, even the ones added multiple times.

How to remove (not just un-select) some search engines?

Solution 1:

In Windows:

• Go to C:\Program Files (x86)\Mozilla Firefox\browser\searchplugins
• Remove all XML files except for the ones you want to keep

Here is mine:

And my FF search choices now:

In Ubuntu:

The XML files for the default search engines were located in /usr/lib/firefox/distribution/searchplugins/locale, while the ones added by the user in /home/username/.mozilla/firefox/some_profile_folder.default/searchplugins.

Solution 2:

...and if you have added any in Windows 7 that you want removed, they will be found here: C:\Users(User Name)\AppData\Roaming\Mozilla\Firefox\Profiles\kmyog13g.default\searchplugins