Why? I'm not suggesting to have an extension that has access to your file system. Bitwarden has browser extension that communicates to Bitwarden vault via HTTP and it's easy to autofill passwords or generate new credentials.
For throwaway accounts or demo accounts or any kind of new web service/app accounts, it's easy to memorize username and autogenerate a strong, safe password which are saved to vault.
You have the access to that same vault from a different device (smartphone etc), it makes interacting with passwords and its storage extremely easy and without mistakes.
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There's plenty.
Why? I'm not suggesting to have an extension that has access to your file system. Bitwarden has browser extension that communicates to Bitwarden vault via HTTP and it's easy to autofill passwords or generate new credentials.
For throwaway accounts or demo accounts or any kind of new web service/app accounts, it's easy to memorize username and autogenerate a strong, safe password which are saved to vault.
You have the access to that same vault from a different device (smartphone etc), it makes interacting with passwords and its storage extremely easy and without mistakes.