@alanz @ghost
Even so, it's still 15 seconds every start-up, that the browser is unresponsive - and this rate scales further, such as my case of (yes, really) 4000 tabs, which took 40 seconds of waiting per boot-up

Factoring in the additional memory footprint savings, this leaves a clear advantage to not have a bajillion tabs open - not to mention that the current means of searching and browsing through many opened tabs is fairly limited, to only the tab slider arrows on the left and right of the toolbar