Explain how Firefox uses user profiles (#2262)[deploy site]

This extends the Firefox profile documentation by explaining how
Selenium works when supplying an existing profile directory. Since
profiles are not cleaned up by Selenium, it also describes how they can
be explicitly removed by the user.

Co-authored-by: Sri Harsha <[email protected]> 8945c9e

Author: selenium-ci

documentation/_print/index.html

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documentation/about/_print/index.html

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