firefox - is there a way to split a single browser's window/tab into 2 viewing areas?

I have to frequently visit a webpage that contains a table with thousands of lines. The first row contains the names of the columns. Many of the columns are numerical values.

Once you scroll/page down, the first line is gone, and with it the headers.

Is there a way to horizontally split a Firefox/Explorer window, so that in the upper part you keep the first row with the columns' names, and you scroll up/down the lower window?

I don't have control over the design of the website.

Thanks.

Answer

You could try the Split Browser addon.