An extension could pull a list of all cookies from all sites for searching, but there isn't a built-in feature for that. Here in support, we work with the Firefox we have today, including features, settings, and workarounds (e.g., add-ons). We can't really help with suggested feature changes. You could submit comments and suggestions for feature changes through one or more of the following links, or recently I saw someone created a Change''.''org petition (no idea whether that helps): * Feedback: https://qsurvey.mozilla.com/s3/FirefoxInput/ * Discourse: https://discourse.mozilla.org/c/firefox-development * Reddit: https://www.reddit.com/r/firefox/ * Twitter: https://twitter.com/firefox * Facebook: https://www.facebook.com/Firefox