Clear browsing data with a single click is a great idea but it doesn't work for me. Checked all the extension settings and tried it out multiple times.
Having "Cleared Browser Data" with the extension toolbar button I then look into the Firefox settings and there are still cookies and other saved data sitting under the "Manage Cookies and Site Data" heading.

I re-installed this extension again but it still doesn't clear all the data it claims to.
Nice idea but it doesn't work.