That dude is just slow and doesn't understand his tools. I have several thousand tabs open and it takes all of half a second to jump to any one of them. FF allows you to search open tabs just by using the address bar. Let's say you're researching camera lenses and you have 5 youtube videos open, several forum posts, the lens maker's website open, and a bunch of different sales websites like adorama and b&h open. Do you literally bookmark those and close them all to end your day and then just reopen them the next? Why not just leave them open. FF handles it fine.