Crusher is an extension that automatically adds a scrollbar to tables that are wider than the page.
Example
The following is a very wide table with a scrollbar added by Crusher.
Lorem | ipsum | dolor | sit | amet, | consectetur | adipiscing | elit. | Pellentesque | ac | massa | sit | amet | dui | finibus | porttitor. | Aenean | nulla | nulla, | blandit | vestibulum | mollis | nec, | rutrum | vel | ex. | Sed | at | tortor | in | tellus | semper | lobortis. | Ut | ut | augue | turpis. | Suspendisse | maximus | justo | nibh, | non | interdum | diam | convallis | id. | Vivamus | vitae | mauris | ex. | Pellentesque | faucibus | vel | metus | eu | tincidunt. | Sed | lobortis | dui | sed | risus | eleifend | egestas. | Praesent | a | bibendum | nibh, | et | suscipit | massa. | Duis | eget | magna | maximus, | blandit | nunc | sed, | consequat | nibh. |