I am looking for a firefox extension that allows the user to block IndexedDB reads/writes from user-defined sites.
IndexedDB is a form of locally stored data that websites can create on your computer. Unfortunately, Firefox has no built-in option to delete this data. Clearing the browser's cache will never delete this data. This creates serious privacy issues, and possibly some security ones as well.
Any cost is acceptable for the add-on. Any operating system is acceptable. Open source or closed source is acceptable, but a preference (not requirement) for open source.
Must be compatible with Firefox 42 or later.