The picture speaks for it self.
Same tabs - same sites - same resources - same time - same logins.
Firefox is just a memory leak before it crash your linux box! But it is the most extensible browser. You can do almost everything via Addons.
Chrome is the middle & safe solution but i cant use xmarks with a custom server and i cant use different proxies with exclusions but only shell variables (http_proxy).
Midori has the same engine as chrome (webkit, same restrictions as Chrome. Isnt extensible as chrome but uses UserScripts & UserStyles
But midori uses the least memory, its super fast and perfect for your simple needs.
My opinion is NOT to use only one web browser, but choose the browser by the need you want to cover.