Implement `hide` and `hidden` events for tabs
Implement `hide` and `hidden` events for tabs

BS3 commits: ab8dbc214e7ea43fec65c4464b8db7392f3df905

mozillo/todc-bootstrap,ztx1491/todc-bootstrap,2947721120/todc-bootstrap,up2vs/todc-bootstrap,todc/todc-bootstrap,todc/todc-bootstrap,2947721120/googlebt4,todc/todc-bootstrap,aaroncnhk/todc-bootstrap