Switching repeatedly between two accounts on one website makes it easy to act under the wrong identity. Firefox’s container tabs can keep separate website sessions within one browser, with a visible colour and name to help distinguish them.

Create a small, recognisable arrangement

Use Mozilla’s official Multi-Account Containers extension and review its requested permissions before installation. Open its toolbar menu and choose or create a container for each purpose. Use meaningful names such as the two organisation names, rather than two nearly identical colours with no explanation.

Open the website in the first container and sign into the intended account. Open it in the second container and use the other account. Check the website’s own account display in each tab. The container label helps you navigate, but the account shown by the service remains the final identity check before an upload or edit.

Test how links reopen

Try a harmless document view in both tabs. Then open a familiar bookmark or link and inspect which container receives it. The extension can assign a site to a container; review such assignments carefully when the same site genuinely needs two identities.

Mozilla notes that containers are disabled in Private Browsing windows and when Never Remember History is selected. If the controls disappear, check that context before reinstalling the extension. A private window is not an interchangeable substitute for the persistent container arrangement.

Keep shared-computer privacy separate from session organisation. Someone using your unlocked browser can still interact with its open accounts. Sign out or lock the operating-system session when handing the machine to another person, and follow any organisational restrictions on extensions.

Source: Mozilla Support.