>This add-on limits tabs by removing a tab (least recently used, newest, left-most or right-most) when a new tab is added that takes the number of open tabs to more than the limit >This was created to keep my #autistic son sane. Without it, he would open a zillion tabs, then get frustrated when the system bogged down. https://addons.mozilla.org/en-US/firefox/addon/rudolf-fernandes/