Suddenly, I can not pull up Firefox. it is version 45.0. I was on the day before yesterday, and I was scanning through the support pages because I want to block the thing that stops Firefox from going to another page, but I never figured it out. Probably did something by mistake. Message: "Firefox is not responding" - blank browser screen. When I follow "We've made some educated guesses about your current browser and operating system" on the support page it brings up blank fields. I did try to download a newer version a couple of weeks ago, but the download did not go through. I am able to pull up Safari, but I prefer Firefox. Running Mac OS 10.10.5. Is there a phone number for Mozilla support? Looked and could not find it. Thankyou.