Cookies tip

Feeds updating could create cookies from called sites that decide to associate a cookie with the RSS feed withdraw.

These cookies, because created via a Webextension, cannot be removed by an extension such as ForgetMeNot which doesn't even see them.

There is a work-around which is to set the extension's UUID as blocked in Firefox's Options / Privacy & Security / Cookies and Site Data / Exceptions.

Note: this page is an extract from issue [Feature request] Option to open item links from a render page in a new tab. Thank you to @StanGets for this tip.