Here’s what file browser looks like when browsing the root file system normally:
As you can see, all of the hidden/system folders are not shown. If you hit Ctrl+H at this screen, you will immediately see all the hidden files:
Fairly useful shortcut key. If you would just prefer to make this be the default setting when using file browser, go to the Edit menu and select Preferences:
Check the “Show hidden and backup files” checkbox, and you should now see the hidden files all of the time.