1337x extension is a web browser extension that provides a better user experience on 1337x site(s).

show torrent thumbnail on index lists
filtering index lists based on name, uploader, size, and number of seeders
display images instead of links and/or small images with big ones on torrent pages (image extractor)
ajax based fetching of data for index pages with pagination (e.g. search page). this provides a single table which includes whole index data and can perform filtering on them