This useful feature of IE8 as web slices (web fragments) can also be used in Firefox. This task is entrusted to cope with the addition of Webchunks . While this addition is in the alpha stage, it is quite tolerably coping with its task (albeit with brakes in some places). The most useful thing about it is that you can easily customize the display of any part of the site you like in the slice itself.
For example, it is very convenient to follow the comments, display any news block or some informer from the site. Simply select the “Create your own webchunk in current page” in the Webchunks toolbar and on the page itself show the desired area you want to follow through the slice:
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And opening a slice, see only that part of the site that is interesting: