Is your extension a Firebug extension?
If not, the simplest solution is to select the element(s) via 
document.evaluate()<https://developer.mozilla.org/en-US/docs/DOM/document.evaluate>and
 then change it's/their style e.g. via element.style.backgroundColor 
= "yellow";.
If yes, you can reuse the inspector logic like it's done in 
Firebug<https://github.com/firebug/firebug/blob/master/extension/content/firebug/chrome/reps.js#L677>
.

Sebastian

On Thursday, September 20, 2012 6:50:03 AM UTC+2, madura pradeep wrote:
>
> No.I'm not need this.I have the xpath of an element in the open url.I want 
> to highlight the object relevant to that url by using it xpath such as 
> selenium ide do (In selenium ide ,give xpath as target and when click on 
> the find button it highlight the object)
>
> On Tuesday, September 18, 2012 7:22:26 PM UTC+5:30, Jan Honza Odvarko 
> wrote:
>>
>> There are some APIs exposed to extension, check out this post: 
>>
>> http://www.softwareishard.com/blog/firebug-tutorial/extending-firebug-inspector-part-x/
>>  
>>
>> Not sure if this is what you need. 
>> Honza 
>>
>> On Sep 18, 9:15 am, madura pradeep <[email protected]> wrote: 
>> > How to use object highlighter which is used inside html panel, for 
>> > extensions? Is it possible to give xpath and highlight the element? 
>>
>

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