I use multiple Firefox profiles to help with this: personal, work stuff (non-dev), API docs, and dev. I have different add-ons for each--e.g., NoScript in the p

I use multiple Firefox profiles to help with this: personal, work stuff (non-dev), API docs, and dev. I have different add-ons for each--e.g., NoScript in the personal profile and Firebug in the dev profile. I'm never tempted to open Reddit/HN/email/etc in my work-related profiles because I hate the idea of polluting my browser history. The other key to this, for me, is virtual desktops that roughly correspond to the FF profiles. There's at least a little effort involved in switching desktops, but sometimes I need to shut down the personal FF instance, too.