Hello,
I have just released addons for Chrome and Firefox. They create random aliases that are tight to domains/services at which they were used. As backend service they use https://c0x0.com service. Please let me know what do you think, here are the links:
Firefox:
https://addons.mozilla.org/en-US/firefox/addon/c0x0-com-addon/
Chrome:
https://chrome.google.com/webstore/detail/c0x0com-browser-extension/leknobglbcbfkcldpcjfbnpbapefiehp
Thank You!