Currently I have 267 tabs loaded in Firefox and in any given day I might load 50-100 tabs which I devote around 2 hours in a day to reducing down to around the 250 mark. I had about 420 tabs but in the last couple of weeks I have actively reduced them to the essential 'must-read' one day. http://imgur.com/1K4s6MP (this was a couple of days into my drive to reduce my tabs). Oh and I use firefox on linux. Hands down the best browser I have ever used.