A lot of the errors (especially if they're warnings) are normal (many websites have some IE-specific code and some of that code generates warnings). The simplest way to see if there are errors on the current page is to click "Clear" in the error console and then reload the page. Also, errors (and less-often warnings) can come from extensions so you may see errors even if they're not related to the current page. * You can also use the "Tools > Web Developer > Web Console" (Shift+Cmd+K) to check for error on the current tab.