Firefox supports profiles, you can use the Profilist extension which makes it easy to switch between (I keep a separate profile for sites I use my work login on) <a href="https:&#x2F;&#x2F;addons.mozilla.org&#x2F;en-US&#x2F;firefox&#x2F;addon&#x2F;profilist&#x2F;" rel="nofollow">https:&#x2F;&#x2F;addons.mozilla.org&#x2F;en-US&#x2F;firefox&#x2F;addon&#x2F;profilist&#x2F;</a>