Can only cite a URL in one specific template type but the speedy convenience of it is incredible and makes me edit wikipedia more. I only ever ended up using "simple reference". Hope they add more templates to it

Unfortunately it doesn't work in my Firefox 52.5.2, 64 bit, esr channel, on fully updated Win 10 Pro.

At first I thought another Add-on might interfere, but then I disabled them one after another, restarting Firefox in between, of course, until this one was the only one left -- no dice.

I have the standard theme, and only the plugins that came with Firefox.

Then I tried one of the older versions, and still no luck.

At first I thought the problem might be on English language sites, so I went to spon.de, amazon.de and sueddeutsche.de -- I studied in Bavaria for a year -- and finally to my library in Google Books, all without success, I'm sorry to say.

I'm a really experienced computer user, have been building my own computers since MS-DOS, did basic programming in various basic languages including JavaScript and PHP, worked for a while as a freelance computer troubleshooter for small offices and and home users, so I think I did everything I can do on my end.

If there is anything I can do to help, please let me know.