I have had this problem for a while, probably since before FF 24. Steps to reproduce: 1. Open Firefox. 2. Close my macbook (locks screen). 3 Open macbook and log in. 4. Go back to Firefox. 5. Open a new tab. 6. Click a bookmark. What happens is the new tab will not load the page. I have noticed that if I wait a certain amount of time, say ten seconds, and then hit the bookmark, it loads fine. However, if I load the bookmark too early, it somehow can't load the website. Here's the weird thing. I close the tab, and open a new one, and load that page, and it STILL won't load. My theory is that the network isn't quite in a good state to perform http connections when I first try to load a website. But Firefox is keeping track of open connections, so it won't let me make a NEW connection to the website again until the original request times out. So I am forced to wait for maybe 30 seconds until the site times out. Note that within a few seconds of trying to load the first site, other sites will load fine, but that original site will not load until the first request times out.