To log into multiple accounts of family members, use the Firefox Multi-Account Containers extension. To install the extension:

1. Visit addons.mozilla.org/en-US/firefox/addon/multi-account-containers on Firefox.
2. Click on Add to Firefox, and then on Add.

To create new containers or profiles for each Zerodha account:

1. Right-click on the new tab button.
2. Click on Manage containers.
3. Click on Add New Container.
4. Enter the name, colour, and icon as per your preference.
5. Click on Done.
6. Right-click on the new tab, and select the newly created container.

Now, when the user logs in to Kite and saves preferences, all the preferences are saved to this container. The user can create a separate container for each Zerodha account and switch between the containers to access that particular Zerodha account's preferences. To switch between containers, right-click on the new tab button and select the container.