Update README with new default behavior

README.md

@@ -24,8 +24,10 @@ Usage: <main class> [-h] [-c=<pathToCookiesFile>] [-d=<pathToDownloadFolder>] [-
 ## Bandcamp authentication 
 
 This tool does not manage authentication with Bandcamp servers, as they require a valid token from Google Captcha.
-Hence, authentication must first be achieved using Firefox, then Bandcamp cookies must be exported in JSON using the Firefox Addon [Cookie Quick Manager](https://addons.mozilla.org/en-US/firefox/addon/cookie-quick-manager/). 
-This JSON file can then be used using the mandatory parameter `--cookies-file`:
+Hence, authentication must first be achieved using Firefox. Then there are two possibilities:
+- If running a Linux system (and if the `--cookies-file` parameter is not used), then the tool will automatically find the required cookies in the Firefox profile folder of the system user.
+- Else, Bandcamp cookies must be exported in JSON using the Firefox Addon [Cookie Quick Manager](https://addons.mozilla.org/en-US/firefox/addon/cookie-quick-manager/). 
+This JSON file can then be used using the parameter `--cookies-file`:
 
 ## Installation