This has been driving me mad for days now. I updated to the latest version of Firefox, but every single time I go to any webpage on Tumblr, (my dashboard, my personal blog, anyone else's blog) I am bombarded by error messages saying "too much recursion." I usually get anywhere from 3 to 5 messages per page. I reverted to Firefox 34 and can now access Tumblr just fine, but then I am faced with a different problem. When watching videos or vines on Tumblr, they can spontaneously lag, jitter, or stop playing. If I try to resume playing them, then they might start playing but all audio will be cut out. This seems to cause some kind of problem with Flash Player, because after it happens on Tumblr, then it will happen on ANY video playing site I visit. If I try to watch a video on Youtube, the video will spasm for a couple seconds and then go to static and say "An error has occurred, please try again later." I've tested it out on other video sites like Blip, and they also cause audio and video bugs. Even if I close Firefox and restart it, the issue will not be solved. The only way I have found to fixing the crashes is to manually reinstall Flash Player (which requires me to reset Firefox anyway). This has been a tremendous annoyance, as I have had to reinstall Flash Player and reset Firefox about five times on any given day for the past week or so. This is driving me to consider dumping Firefox for Chrome, and I don't want to do that.