Don't remember if this has been mentioned before. There is actually a quite good small app for easy 3rd party plugin management (see what file types are handled by what plugin and enable/disable different plugins on the run). The app is freeware, in English and called Plugin Chooser. I got it from

<a href="http://www.asahi-net.or.jp/~rb2t-kmc/soft/npc11a.zip">http://www.asahi-net.or.jp/~rb2t-kmc/soft/npc11a.zip</a>;

To run it from inside K-Meleon, you have to write a macro as follows:

chooser {
menu = Plugin Manager
exec(C:\xxx\NpChooser.exe)
}

replace xxx with your path to npchooser.exe and then add those lines to the end of your macros.cfg

Then you have to put the line

macros(chooser)

under some menu in your menus.cfg (I put it under &Edit like that:

&Edit {
Cu&t\tCtrl+X = ID_EDIT_CUT
&Copy\tCtrl+C = ID_EDIT_COPY
&Paste\tCtrl+V = ID_EDIT_PASTE
&Select All\tCtrl+A = ID_EDIT_SELECT_ALL
-
&Find in Page\tCtrl+F = ID_EDIT_FIND
-
macros(chooser)
&Preferences = ID_PREFERENCES
}

You can do that inside K-Meleon as well (from Edit - Preferences - Configs). Works nice. Take a look at Plugin Chooser's readme first (you have to set up your K-Meleon\Plugins directory for the application).