I have been having problems with Firefox on Facebook. Could not post personal photos. But could post any photos found on the Internet, unless I changed the name of photo. Now my Facebook page is just a jumble of black-and-white letters filling the entire page, some letters unrecognizable. I've tried resetting Firefox. I have shut off & on all plug-ins, add-ons, etc. I am assuming this has occurred since the latest install of Windows updates. I am using Windows 7 & plan to upgrade to 10 soon. I prefer Firefox over Google Chrome & hope that I will not have to switch just to use Facebook. Once again Facebook is just a jumbled screen of black-and-white text, letters with strange fonts. (PC code or script) I have ran various security scans & PC cleanup tools. It seems to be only on Facebook when using Firefox. Facebook is working fine with Google Chrome. all other web sites seem to be working fine with Firefox.