reset permissions instructions

[FallenRiteMonk]

It would be a nice to have detailed instructions on how a user can reset his permissions in the browser.

It often happens that when a user is asked for permissions (ex. camera) he immediately denies it. Once a user has denied a permission, a site creator can only instruct him on how to reset those permissions, but not reset them for the user. Since every browser has its own way of resetting permissions, it would be nice to have such instructions on a site like 'whatwebcando', so one can link users to that site and does not have to maintain those instructions by him self.