Custom tokens disappear when closing and reopening browser

[soulBit]

Hi Nifty team, I experienced this issue whilst using the Chrome extension - if you add a custom token from the "Tokens" -> "Add Token" -> "Custom" menu it will appear in the wallet as expected, however after closing the browser and reopening it, the token will no longer be present

What browser and version did you use?

Brave Version 1.19.88 Chromium: 88.0.4324.96 (Official Build) (64-bit)

What operating system did you use?

Windows 10

Do you have screenshots showing the problem?

• None needed, see issue.

What is your issue?

• Custom tokens added to an address are not retained when closing the browser