On Nov. 14, 2017, Mozilla is expected to release Firefox Quantum (Firefox 57). This update brings faster and significantly better performance; however, this first version of Firefox Quantum will NOT be fully accessible with JAWS screen reading software.
Freedom Scientific suggests a short-term work-around as a way to avoid upgrading to FireFox Quantum while maintain important security fixes. This recommendation is to install Firefox ESR (Extended Support Release).
Freedom Scientific states that they are working closely with Mozilla to resolve the issues. For more details about the compatibility of Firefox Quantum and JAWS, click here.