Steps to reproduce:
1-Go to any rtl wiki (arwiki, fawiki, hewiki, etc).
2-View any page using simple skin (see url) under Firefox.
3-You can't click on any link in the article. However, links in the sidebar (Main Page, recentchanges, etc) and interwiki links work as expected.
1-IE does not have this problem and I didn't try other browsers.
2-Other skins don't have this problem.