Ah I reckon what you meant was "Oh this approach only temporarily installed the add-on, your parent post was asking about a way to permanently install an add-on

Ah I reckon what you meant was "Oh this approach only temporarily installed the add-on, your parent post was asking about a way to permanently install an add-on." Took me a while to figure out what you meant. Ah missed that; yep, the add-on will remain installed until the browser is restarted. That is a little annoying!