Expiration of the list of trusted websites?

[woctezuma]

In the README, you mention that "insecure websites" are purged from the list after 7 days:

Otherwise, that host is added to the list of known insecure sites, and all subsequent requests to it are ignored by the extension for seven days.

It adds that site to the list of known insecure sites, and does not try to load it over HTTPS for the next seven days.

However, you don't mention the expiration date for the list of trusted websites? Is that list permanent?

For instance, this is what the list of trusted websites looks like after I exported the settings to JSON: