JabRef can download citations from the IEEEXplore database. To use this feature, choose Web search -> Search IEEEXplore, and the search interface will appear in the side pane.
To start a search, enter the words of your query, and press Enter or the Fetch button.
The search is done in guest mode, which means that a maximum of 100 results will be returned.
You may opt to download the abstracts along with the cite information for each entry, by checking the Include abstracts checkbox. This causes a significantly larger amount of network queries, so to avoid excessive pressure on the IEEEXplore web site, JabRef will refuse to download abstracts for searches returning more than a given number of hits.