Canned Emails - A minimal site with prewritten emails
Adblock Plus - AdBlock Plus is a browser extension for Firefox, Chrome, Opera, and several other popular browsers that prevents intrusive ads like pop-ups and malicious code from appearing on websites you visit.
Rename Email - Easily change the subject of any email, by cloudHQ
uBlock Origin - Popular and efficient blocker for Chromium, Chrome, Edge, Firefox, Opera, Safari, Thunderbird.
analyze.email - Test the spam-y-ness of your emails
AdGuard - Surf the Web Ad-Free and Safely. Shield up!