The TabBrowser Extension has been updated and no longer crashes Firefox. This is an almost essential addon as amongst other things its the only extension that provides a CTRL Click on a tab to close the tab. (It also provides functionality to open a link in a tab but this is available with other extensions). All the other ones rely on a middle click, and as I’m using a trackpoint mouse I don’t have a middle button and as I’m so used to having this facility it was a nightmare to not have it and to have to right click, then choose close on the tab.