HTTPS Everywhere's exceptions persist
Using Tor it is recommended to try secure connections first. Unfortunately HTTPS Everywhere doesn't work this way by default: https://www.eff.org/https-everywhere/faq#why-use-a-whitelist-of-sites-that-support-https-why-cant-you-try-to-use-https-for-every-last-site-and-only-fall-back-to-http-if-it-isnt-available
To try secure connections first, the user has to Disable all unencrypted requests. When HTTPS Everywhere is set to Disable all unencrypted requests, [[span(style=background-color: #FFC8C8, the exceptions (the sites visited via HTTP) persist even after Tor Browser is closed.)]]
When HTTPS Everywhere disabled on a site, Reset to Defaults is not available from the button. To clear the list the user has to open the about:addons page, select HTTPS Everywhere's options and remove sites 1-by-1 from the HTTPS Everywhere Sites Disabled list. There is no "clear all" button.