I am having the same problem on several different PC's. If I go to a site that requires a login, such as the national lottery; the fields are navigable and items such as buttons work. Once I login, these fields become unnavigable and non-operational. I can refresh the page and still nothing. I have Rapport, Dashlane, Ghostery and ABP installed, but have disabled them (apart from Rapport) and that makes no difference. Further more, Windows 10's Internet Explorer works with Rapport and Dashlane installed...and this has been my workaround. Anybody else getting this problem. It seems strange that I am getting it on all of the PC's I use, but I imagine I've set them up pretty much the same. Firefox is set up to forget everything on exit and no passwords are stored (hence Dashlane). Thanks in advance for any help.