There are many pages that disable right-click on them. Their authors do not want people to see the page HTML source, copy links, images, etc. Usually you get a message box that says that right-click is disabled because of copyright issues.

If you need to get an address of a link on such page you can simply drag the link to Portable Offline Browser Projects tree and get a new Project with the desired URL.

Another way is still get the page context menu. Simply press your right mouse button on the page and hold it. When the message appears, press the Space key on your keyboard once to remove the message and only then release the mouse button. You will get the context menu.