Screenshot:

When finished your search bar should look like this.

So after  a bit of Googling and hacking, I found an easy way to add a custom search into your Firefox search bar (next to the url). I even ghetto-rigged a favicon inside of it, even though it does no justice to the normal ITPub.net favicon (I wasn’t able to extract this from their website, even though their HTML source code is ONLY 50% Chinese).  Without further adieu, here are the steps necessary to make a custom Firefox search plugin for ITPub.net and begin finding your favorite IT-related books:

1. Navigate to the C:\Program Files\Mozilla Firefox\searchplugins directory of your computer (assuming you are running Windows)
2. Copy and Paste ANY of the current search plugin files (.xml) and rename it to “itpub.xml”.
3. Open the newly created .xml file in Notepad (easiest) to prepare it for editing.
4. Delete everything inside of it (or read it, if you want to know what is going on). If you choose one like Google or Yahoo! (assuming you have both of them installed), you can also see how they do their type-ahead search feature based off the first few letters that you type in the search box.
5. Paste the exact code shown below, then save and close:
   
<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
<ShortName>IT Pub</ShortName>
<Description>ITPub.Net Search</Description>
<InputEncoding>UTF-8</InputEncoding>
<Image width="16" height="16">data:image/x-icon;base64,AAABAAEAEBAAAAEAIABoBAAAFgAAACgAAAAQAAAAIAAAAAEAIAAAAAAAQAQAAAAAAAAAAAAAAAAA
AAAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAA
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AAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAACAAICAgACAgIAAgICAAICAgACAgIAAgICAAICAgACA
gIAAgICAAICAgACAgIAAgIAAgAAAAIAAAACAAAAAgAAA3ADc3NwA3NzcANzc3ADc3NwA3NzcANzc
3ADc3NwA3NzcANzc3ADc3NwA3NyAAICAAIAAAACAAAAAgAAAAIAAANwA3NzcANzc3ADc3NwA3NwA
gAAAAIAAAACAAADcANzc3ADc3NwA3NzcANzcgACAgACAAAAAgAAAAIAAAACAAADcANzc3ADc3NwA
3NyAAICAAIAAAACAAAAAgAAAAIAAANwA3NzcANzc3ADc3IAAgIAAgAAAAIAAAACAAAAAgAAA3ADc
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AIAAANwA3NzcANzc3ADc3ACAAAAAgAAAAIAAAACAAAAAgAAA3ADc3NwA3NzcANzcgACAgACAAAAA
gAAAAIAAAACAAADcANzc3ADc3NwA3NwAgAAAAIAAAIAAgIAAgAAAAIAAANwA3NzcANzc3ADc3IAA
gIAAgAAAAIAAAACAAAAAgAAAgACAgIAAgICAAICAAIAAAACAAADcANzcAIAAAACAAADcANzc3ADc
3NwA3NyAAICAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAA3ADc3IAAgIAAgAAA
AIAAANwA3NzcANzcgACAgACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAANwA3NyA
AICAAIAAAACAAADcANzc3ADc3IAAgIAAgAAAAIAAAACAAAAAgAAA3ADc3NwA3NzcANzc3ADc3NwA
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AIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAA
gAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACAAAAAgAAAAIAAAACA
AAAA//4AAP//AACABwAAgAcAAIcHAACHhwAAh4cAAI+HAACNhwAAjYcAAPzHAAD8xwAAgMcAAIDH
AAD//wAA//8AAA==</Image>
<Url type="text/html" method="GET" template="http://www.itpub.net/search.php">
<Param name="srchtxt" value="{searchTerms}"/>
<Param name="orderby" value="lastpost"/>
<Param name="ascdesc" value="desc"/>
<Param name="searchsubmit" value="yes"/>
</Url>
<SearchForm>http://www.itpub.net/search.php</SearchForm>
</SearchPlugin>

6. Save and close.

That’s It! Now close and restart Firefox and check the Search bar and look for your newly created ITPub.net plugin. Enjoy!