I use waterfox classic and will probably continue to use it till I die, though with the addon enhancements, I am seriously thinking of trying waterfox current or firefox with the extra addons and the like installed to see if now that everyone seems to be using the new mozilla framework if I get better access with the quantom branch.

In thunderbird, my access has not changed, though I do not use addons so don't need to fiddle with the addon interfaces.