Return Youtube UI wót 42null

The purpose of this extension is to remove rounded corners on video players, thumbnails, menus, and if desired, controls. This extension uses JavaScript to inject JavaScript, CSS, and HTML into YouTube pages in order to replicate the look of YouTube before a more rounded UI was implemented. Updates are still being made, but much of the old look is already back. Changes are made to the look only, no data is ever sent or shared. To remove all changes made by the extension, just remove the extension and reload the page.