SiteAmnesia от Emerson Veenstra

Small, simple extension to delete stored website data from sites you visit. You can specify a default setting, and per-hostname overrides.

The three options are "never", to never delete data, "noActiveTabs" to delete data once no tab is using it, and "always" to constantly delete data even if it's currently in use

The initial default is "never", to allow you to set exemptions before starting to delete data.

See the repository for more information and details: https://codeberg.org/emersonveenstra/siteamnesia