Greasemonkey is a Firefox (FF) extension that runs JavaScript code based 
on URL filters.
- Install Greasemonkey
- Drag script "<file>.user.js" and drop on FF
Scripts can be managed and edited via the Greasemonkey menu.

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// ==UserScript==

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// @name            mcnet

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// @namespace       anonymous

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// @version         0.1

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// @description     menu fixed to screen in threads

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// @include         http://www.mikrocontroller.net/topic/*

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// @include         http://mikrocontroller.net/topic/*

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// @include         http://www.embdev.net/topic/*

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// @include         http://embdev.net/topic/*

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// ==/UserScript==

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GM_addStyle('.nav-container {position: fixed;}');

I would like to add a search field for the 'articles' (wiki) section 
underneath the menu and add some buttons to assist with writing messages 
(enclose selection with

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[c][/c]

 for example. Insert special characters..

If you have something to contribute, I suggest just adding the code 
snippets to this thread enclosed in the "pre" tags explained in 
"Formatting options" on the "New post" page.