sebi

When starting Firefox with the command line, you can specify the profile you want to open with -P

So firefox -P "Joel User" starts the profile ‘Joel User’.

Further reading

This is a professional debug techique, what are you talking about? But I rather use ‘Hii’ with various (but not ascending) amounts of i’s.

Edward Snowden remarked:

Arguing that you don’t care about the right to privacy because you have nothing to hide is no different than saying you don’t care about free speech because you have nothing to say.

There is a wikipedia article regarding this argument

I agree, someone has to store and maintain your data, but giving all instances access to it is a risk that could be avoided

So any instance admin can analyze all users upvotes/downvotes and possibly derive political standpoints, likes/dislikes, opinions and location data from it