Okay I’ve to confess that this trick will only work in Firefox, but for those who doesn’t want to start their Gimp/Photoshop-something for getting rounded corners on page elements, this CSS hack might be a proper solution:

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<p style="-moz-border-radius-topleft: 5px; -moz-border-radius-bottomright: 5px; background-color: #ebebeb; padding: 10px; color: #000;">Lorem ipsum dolor sit amet, consectetuer sadipscing elitr, sed diam nonumy...</p>

By using the CSS extension -moz-border-radius-direction made by Mozilla, this will result in something like:

Lorem ipsum dolor sit amet, consectetuer sadipscing elitr, sed diam nonumy…