Just wanted to say thank you! As a long time user of Self Destructing Cookies, i am preparing to move to Firefox 57, and looking for replacements of add-ons that will not be updating for that version. I'll using your app concurrently on both Firefox 55 and 57. So, if I have anything helpful to add, i'll be back. So far, I love the look and feel of the app, and UI. Reminds me of my other must have add-on, Ublock Origin.