Many of you are already probably doing this but I thought I'd post it anyway. Sorry if its common knowledge. if your managing multiple entities for SEO or BlackHat purposes you really don't want to be logging into different accounts with big G or anyone else using the same browser, cookie sets, bookmarks, etc. Its way too easy to link you to your different properties and also you may make the mistake of logging into one entity with a proxy for a different entity and exposing your relation to it. An easy and clean method to avoid cross pollinating your entities with one browser or IP is to setup a simple .bat file to run FF (instead of running it straight) and then use multiple browser instances with Fresh identities and cookies for each identity you manage. the .bat file should be: @echo off set MOZ_NO_REMOTE=1 start "" "C:\Program Files\Mozilla Firefox\firefox.exe" -p set MOZ_NO_REMOTE=0 When you run it you can build multiple profiles that are all completely independent of each other in every way. Use foxyproxy or something similar to setup a different proxy in each profile. This way your bookmarks, plugins, proxies, cookies and everything are different for every identity that you have attached to site accounts.