Is there a file manager extension for a browser like the standard explorer?

Question

Browsers

You need a browser extension or extension to be able to use it as a file manager like Clover'a

Answer 1

And which browser is suggested to guess?
For Firefox, there are two-pane file managers (maybe suitable for SeaMonkey, they definitely worked on the old Palemoon):
Midday Commander und Fire Commander
This is if there is no FAR or Total Commander at hand. But why do you need to do an addition with a regular manager, which is already installed on every system?
If desired, you can sketch a button to call it in Custom Buttons or use a script in the menu. Minute business.