the @tomthe recently introduced me to the Multi-Account #Containers feature of #Firefox: https://support.mozilla.org/en-US/kb/containers
Not sure if that further increases my #privacy, but turns out that it is really useful for the development of websites! you can have multiple tabs with individual #cookie values etc :)
@martin
I use them mostly for separating different project/client stuff at work using colours to flag them. :)